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This is an automatically generated e-mail. To reply, visit:
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This is a good start, but some modifications are necessary for this to fit in with the design described on the asterisk wiki (https://wiki.asterisk.org/wiki/display/AST/T.38+Gateway). I have made some comments below.</pre>
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<a href="https://reviewboard.asterisk.org/r/1116/diff/8/?file=15881#file15881line58" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/apps/app_faxdetect.c</a>
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(Diff revision 8)
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static const char app_faxdetect[] = "FaxDetect";</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="k">static</span> <span class="kt">int</span> <span class="nf">faxdetect_exec</span><span class="p">(</span><span class="k">struct</span> <span class="n">ast_channel</span> <span class="o">*</span><span class="n">chan</span><span class="p">,</span> <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">data</span><span class="p">)</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">A new application specifically for fax detection should not be necessary.</pre>
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<a href="https://reviewboard.asterisk.org/r/1116/diff/8/?file=15882#file15882line7049" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/channels/chan_sip.c</a>
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(Diff revision 8)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct ast_frame *sip_read(struct ast_channel *ast)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">faxdetected</span> <span class="o">&&</span> <span class="n">ast_fax_request_t38_switchover</span> <span class="o">&&</span> <span class="n">p</span><span class="o">-></span><span class="n">udptl</span> <span class="o">&&</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_test_flag</span><span class="p">(</span><span class="o">&</span><span class="n">p</span><span class="o">-></span><span class="n">flags</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="n">SIP_PAGE2_T38SUPPORT</span><span class="p">)</span> <span class="o">&&</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_test_flag</span><span class="p">(</span><span class="o">&</span><span class="n">p</span><span class="o">-></span><span class="n">flags</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="n">SIP_PAGE2_T38SWITCHOVER</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_fax_request_t38_switchover</span><span class="p">(</span><span class="n">ast</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This should not be necessary. Fax detection when in gateway mode should occur in a framehook listening on the called channel.</pre>
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<a href="https://reviewboard.asterisk.org/r/1116/diff/8/?file=15882#file15882line25859" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/channels/chan_sip.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int handle_common_options(struct ast_flags *flags, struct ast_flags *mask, struct ast_variable *v)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">strcasecmp</span><span class="p">(</span><span class="n">v</span><span class="o">-></span><span class="n">name</span><span class="p">,</span> <span class="s">"t38switchover"</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_set_flag</span><span class="p">(</span><span class="o">&</span><span class="n">mask</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="n">SIP_PAGE2_T38SWITCHOVER</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_set2_flag</span><span class="p">(</span><span class="o">&</span><span class="n">flags</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="n">ast_true</span><span class="p">(</span><span class="n">v</span><span class="o">-></span><span class="n">value</span><span class="p">),</span> <span class="n">SIP_PAGE2_T38SWITCHOVER</span><span class="p">);</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Not necessary, see above.</pre>
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<a href="https://reviewboard.asterisk.org/r/1116/diff/8/?file=15882#file15882line27127" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/channels/chan_sip.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int reload_config(enum channelreloadreason reason)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_clear_flag</span><span class="p">(</span><span class="o">&</span><span class="n">global_flags</span><span class="p">[</span><span class="mi">1</span><span class="p">],</span> <span class="n">SIP_PAGE2_T38SWITCHOVER</span><span class="p">);</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Same.</pre>
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<a href="https://reviewboard.asterisk.org/r/1116/diff/8/?file=15884#file15884line29" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/configs/res_fax.conf.sample</a>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">; Enable/disable T.30 <-> T.38 gateway</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">t38gateway=no</pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This configuration file option is not necessary. T.38 gateway support should be enabled on a per channel basis using a dialplan function (perhaps FAXOPT(t38gateway)=yes).</pre>
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<a href="https://reviewboard.asterisk.org/r/1116/diff/8/?file=15885#file15885line609" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/configs/sip.conf.sample</a>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">; T38 Switchover on faxdetect this will independantly of faxdetect initiate T38 switchover</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">; this is done via res_fax the default is no.</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">;t38switchover = no</pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Not necessary, see above.</pre>
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<a href="https://reviewboard.asterisk.org/r/1116/diff/8/?file=15886#file15886line1609" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/include/asterisk/channel.h</a>
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(Diff revision 8)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">int ast_indicate(struct ast_channel *chan, int condition);</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * \brief Manage AST_CONTROL_T38_PARAMETERS when T38 Gateway is required</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * \param chan</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * \param peer</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * \param active</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * \param f</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * Function is provided by res_fax.so</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> */</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="k">extern</span> <span class="kt">int</span> <span class="p">(</span><span class="o">*</span><span class="n">ast_t38_gateway_handle_parameters</span><span class="p">)(</span><span class="k">struct</span> <span class="n">ast_channel</span> <span class="o">*</span><span class="n">chan</span><span class="p">,</span><span class="k">struct</span> <span class="n">ast_channel</span> <span class="o">*</span><span class="n">peer</span><span class="p">,</span><span class="k">struct</span> <span class="n">ast_channel</span> <span class="o">*</span><span class="n">active</span><span class="p">,</span> <span class="k">struct</span> <span class="n">ast_frame</span> <span class="o">*</span><span class="n">f</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm">/*!</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * \brief send a T38 Switchover Request for channel</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * \param chan</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> * Function is provided by res_fax.so</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm"> */</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="k">extern</span> <span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">ast_fax_request_t38_switchover</span><span class="p">)(</span><span class="k">struct</span> <span class="n">ast_channel</span> <span class="o">*</span><span class="n">chan</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="cm">/*!</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">These two functions are not necessary. All of the T.38 handling should occur in a framehook attached to the called channel.</pre>
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<a href="https://reviewboard.asterisk.org/r/1116/diff/8/?file=15887#file15887line106" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/include/asterisk/res_fax.h</a>
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(Diff revision 8)
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">struct ast_fax_document {</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="k">union</span> <span class="n">t38_gw_framehooks</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="kt">int</span> <span class="n">chan_id</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="kt">int</span> <span class="n">peer_id</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="p">};</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Only one framehook per gateway is needed. Also in the manner that you use this data structure, it should be a struct instead of a union.</pre>
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<a href="https://reviewboard.asterisk.org/r/1116/diff/8/?file=15887#file15887line182" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/include/asterisk/res_fax.h</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">struct ast_fax_session_details {</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/*! Pointer to owner ast_fax_session <used for framehook on gateway> */</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">struct</span> <span class="n">ast_fax_session</span> <span class="o">*</span><span class="n">owner</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This pointer will not be necessary when the T.38 gateway feature is implemented entirely in a framehook. The framehook will be responsible for creating the session, thus it will be able to store a pointer to it somewhere.</pre>
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<a href="https://reviewboard.asterisk.org/r/1116/diff/8/?file=15887#file15887line184" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/include/asterisk/res_fax.h</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">struct ast_fax_session_details {</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/*! Lock with framehooks we will be on multiple threads */</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_mutex_t</span> <span class="n">lock</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This lock won't be necessary either. All of the framehook stuff should run in the same thread. There may be some edge cases where this is not true, so it may be worth investigating. IIRC channel operations are protected by a mutex anyway and all of the framehook operations occur in these critical sections.</pre>
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<a href="https://reviewboard.asterisk.org/r/1116/diff/8/?file=15887#file15887line216" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/include/asterisk/res_fax.h</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">struct ast_fax_session {</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/*! Asterisk channel of T.38 gateway peer */</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">struct</span> <span class="n">ast_channel</span> <span class="o">*</span><span class="n">peer</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This won't be necessary using a single framehook based implementation.</pre>
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<a href="https://reviewboard.asterisk.org/r/1116/diff/8/?file=15887#file15887line264" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/include/asterisk/res_fax.h</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">struct ast_fax_tech {</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/*! starts the gateway session */</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="kt">int</span> <span class="p">(</span><span class="o">*</span> <span class="k">const</span> <span class="n">start_gw_session</span><span class="p">)(</span><span class="k">struct</span> <span class="n">ast_fax_session</span> <span class="o">*</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/*! process frame recieved on T30 side */</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">struct</span> <span class="n">ast_frame</span> <span class="o">*</span> <span class="p">(</span><span class="o">*</span> <span class="k">const</span> <span class="n">process_gw_t30</span><span class="p">)(</span><span class="k">struct</span> <span class="n">ast_fax_session</span> <span class="o">*</span><span class="p">,</span> <span class="k">struct</span> <span class="n">ast_frame</span> <span class="o">*</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/*! process frame recieved on T38 side */</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">struct</span> <span class="n">ast_frame</span> <span class="o">*</span> <span class="p">(</span><span class="o">*</span> <span class="k">const</span> <span class="n">process_gw_t38</span><span class="p">)(</span><span class="k">struct</span> <span class="n">ast_fax_session</span> <span class="o">*</span><span class="p">,</span> <span class="k">struct</span> <span class="n">ast_frame</span> <span class="o">*</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/*! gateway has finished */</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="kt">void</span> <span class="p">(</span><span class="o">*</span> <span class="k">const</span> <span class="n">clean_gw_session</span><span class="p">)(</span><span class="k">struct</span> <span class="n">ast_fax_session</span> <span class="o">*</span><span class="p">);</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Gateway specific start, read/write, and destroy functions should not be necessary. The fax driver can detect that a gateway session is being requested by checking the details structure for AST_FAX_TECH_GATEWAY. The destruction of the gateway session can be handled in the normal destroy_session function.
Using the existing read/write functions to convert frames in gateway mode is a little bit more tricky. My initial thought was to keep some sort of state in the fax driver when a frame is written and use the type of the written frame (AUDIO vs MODEM) to determine whether the next frames that are read should be T.38 frames or AUDIO frames. I think that is a workable idea.
The other idea I had was to not use read() at all during gateway mode or to only use it to send frames in one direction and use a generator to send frames in the other direction. The type of the frame passed to write() would determine which direction a converted frame should be sent in.</pre>
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<a href="https://reviewboard.asterisk.org/r/1116/diff/8/?file=15888#file15888line6933" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/main/channel.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void bridge_playfile(struct ast_channel *chan, struct ast_channel *peer, const char *sound, int remain)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="kt">int</span> <span class="p">(</span><span class="o">*</span><span class="n">ast_t38_gateway_handle_parameters</span><span class="p">)(</span><span class="k">struct</span> <span class="n">ast_channel</span> <span class="o">*</span><span class="n">chan</span><span class="p">,</span><span class="k">struct</span> <span class="n">ast_channel</span> <span class="o">*</span><span class="n">peer</span><span class="p">,</span> <span class="k">struct</span> <span class="n">ast_channel</span> <span class="o">*</span><span class="n">active</span><span class="p">,</span> <span class="k">struct</span> <span class="n">ast_frame</span> <span class="o">*</span><span class="n">frame</span><span class="p">)</span> <span class="o">=</span> <span class="nb">NULL</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Unnecessary, see above.</pre>
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<a href="https://reviewboard.asterisk.org/r/1116/diff/8/?file=15888#file15888line6941" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/main/channel.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static void bridge_playfile(struct ast_channel *chan, struct ast_channel *peer, const char *sound, int remain)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="kt">void</span> <span class="p">(</span><span class="o">*</span><span class="n">ast_fax_request_t38_switchover</span><span class="p">)(</span><span class="k">struct</span> <span class="n">ast_channel</span> <span class="o">*</span><span class="n">chan</span><span class="p">)</span> <span class="o">=</span> <span class="nb">NULL</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">same</pre>
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<a href="https://reviewboard.asterisk.org/r/1116/diff/8/?file=15888#file15888line7094" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/main/channel.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static enum ast_bridge_result ast_generic_bridge(struct ast_channel *c0, struct ast_channel *c1,</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">ast_t38_gateway_handle_parameters</span><span class="p">)</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">ast_t38_gateway_handle_parameters</span><span class="p">(</span><span class="n">c0</span><span class="p">,</span> <span class="n">c1</span><span class="p">,</span> <span class="n">who</span><span class="p">,</span> <span class="n">f</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This is not necessary. A framehook on the called channel will receive this frame eventually and can handle it there.</pre>
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<a href="https://reviewboard.asterisk.org/r/1116/diff/8/?file=15889#file15889line2320" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/res/res_fax.c</a>
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct ast_frame *t38_gw_framehook(struct ast_channel *chan,struct ast_frame *f,</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">case</span> <span class="n">AST_FRAMEHOOK_EVENT_WRITE</span>:</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">return</span> <span class="n">f</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">case</span> <span class="n">AST_FRAMEHOOK_EVENT_READ</span>:</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">break</span><span class="p">;</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">The final implementation will need to intercept frames in both directions.</pre>
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<a href="https://reviewboard.asterisk.org/r/1116/diff/8/?file=15889#file15889line2372" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/res/res_fax.c</a>
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct ast_frame *t38_gw_framehook(struct ast_channel *chan,struct ast_frame *f,</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="k">static</span> <span class="kt">void</span> <span class="nf">ast_t38_gateway</span><span class="p">(</span><span class="k">struct</span> <span class="n">ast_fax_session</span> <span class="o">*</span><span class="n">s</span><span class="p">)</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">The framehook should be set up when FAXOPT(t38gateway)=yes is set and destroyed if FAXOPT(t38gateway)=no is set.</pre>
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<a href="https://reviewboard.asterisk.org/r/1116/diff/8/?file=15889#file15889line2409" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/res/res_fax.c</a>
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(Diff revision 8)
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct ast_frame *t38_gw_framehook(struct ast_channel *chan,struct ast_frame *f,</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="k">static</span> <span class="kt">int</span> <span class="nf">__ast_t38_gateway_handle_parameters</span><span class="p">(</span><span class="k">struct</span> <span class="n">ast_channel</span> <span class="o">*</span><span class="n">chan</span><span class="p">,</span><span class="k">struct</span> <span class="n">ast_channel</span> <span class="o">*</span><span class="n">peer</span><span class="p">,</span> <span class="k">struct</span> <span class="n">ast_channel</span> <span class="o">*</span><span class="n">active</span><span class="p">,</span> <span class="k">struct</span> <span class="n">ast_frame</span> <span class="o">*</span><span class="n">f</span><span class="p">)</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This should be part of the framehook.</pre>
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<a href="https://reviewboard.asterisk.org/r/1116/diff/8/?file=15889#file15889line2490" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/res/res_fax.c</a>
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(Diff revision 8)
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct ast_frame *t38_gw_framehook(struct ast_channel *chan,struct ast_frame *f,</pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">2457</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="p">(</span><span class="n">s</span> <span class="o">=</span> <span class="n">fax_session_reserve</span><span class="p">(</span><span class="n">details</span><span class="p">,</span> <span class="o">&</span><span class="n">token</span><span class="p">)))</span> <span class="p">{</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">2458</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_atomic_fetchadd_int</span><span class="p">(</span><span class="o">&</span><span class="n">faxregistry</span><span class="p">.</span><span class="n">fax_failures</span><span class="p">,</span> <span class="mi">1</span><span class="p">);</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">2459</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_string_field_set</span><span class="p">(</span><span class="n">details</span><span class="p">,</span> <span class="n">resultstr</span><span class="p">,</span> <span class="s">"error reserving fax session"</span><span class="p">);</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">2460</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">set_channel_variables</span><span class="p">(</span><span class="n">chan</span><span class="p">,</span> <span class="n">details</span><span class="p">);</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">2461</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_log</span><span class="p">(</span><span class="n">LOG_ERROR</span><span class="p">,</span> <span class="s">"Unable to reserve FAX session.</span><span class="se">\n</span><span class="s">"</span><span class="p">);</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">2462</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ao2_ref</span><span class="p">(</span><span class="n">details</span><span class="p">,</span> <span class="o">-</span><span class="mi">1</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">return</span> <span class="mi">1</span><span class="p">;</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">2464</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">2465</font></th>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">It is not necessary to reserve the fax session before creating it. For this code, the session should probably be reserved when we first decide we may be doing some T.38 stuff on this channel.</pre>
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<a href="https://reviewboard.asterisk.org/r/1116/diff/8/?file=15889#file15889line2512" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/res/res_fax.c</a>
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static struct ast_frame *t38_gw_framehook(struct ast_channel *chan,struct ast_frame *f,</pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">2479</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="k">static</span> <span class="kt">void</span> <span class="nf">__ast_fax_request_t38_switchover</span><span class="p">(</span><span class="k">struct</span> <span class="n">ast_channel</span> <span class="o">*</span><span class="n">chan</span><span class="p">)</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">same</pre>
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<a href="https://reviewboard.asterisk.org/r/1116/diff/8/?file=15889#file15889line2908" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/res/res_fax.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int set_config(const char *config_file)</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">strcasecmp</span><span class="p">(</span><span class="n">v</span><span class="o">-></span><span class="n">name</span><span class="p">,</span> <span class="s">"t38gateway"</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">2876</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_debug</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span> <span class="s">"reading t38gateway '%s' from configuration file</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">v</span><span class="o">-></span><span class="n">value</span><span class="p">);</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">2877</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">general_options</span><span class="p">.</span><span class="n">t38gateway</span> <span class="o">=</span> <span class="n">ast_true</span><span class="p">(</span><span class="n">v</span><span class="o">-></span><span class="n">value</span><span class="p">);</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This should not be in the configuration file. See above.</pre>
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<a href="https://reviewboard.asterisk.org/r/1116/diff/8/?file=15889#file15889line2952" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/res/res_fax.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int acf_faxopt_read(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t len)</pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">2919</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">strcasecmp</span><span class="p">(</span><span class="n">data</span><span class="p">,</span> <span class="s">"t38gateway"</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Same as below, match on "t38_gateway" and "gateway".</pre>
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<a href="https://reviewboard.asterisk.org/r/1116/diff/8/?file=15889#file15889line3028" style="color: black; font-weight: bold; text-decoration: underline;">/trunk/res/res_fax.c</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">static int acf_faxopt_write(struct ast_channel *chan, const char *cmd, char *data, const char *value)</pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">2995</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="o">!</span><span class="n">strcasecmp</span><span class="p">(</span><span class="n">data</span><span class="p">,</span> <span class="s">"t38gateway"</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">2996</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">const</span> <span class="kt">char</span> <span class="o">*</span><span class="n">val</span> <span class="o">=</span> <span class="n">ast_skip_blanks</span><span class="p">(</span><span class="n">value</span><span class="p">);</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">2997</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">ast_true</span><span class="p">(</span><span class="n">val</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">2998</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">details</span><span class="o">-></span><span class="n">option</span><span class="p">.</span><span class="n">t38gateway</span> <span class="o">=</span> <span class="n">AST_FAX_OPTFLAG_TRUE</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span> <span class="k">else</span> <span class="k">if</span> <span class="p">(</span><span class="n">ast_false</span><span class="p">(</span><span class="n">val</span><span class="p">))</span> <span class="p">{</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">3000</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">details</span><span class="o">-></span><span class="n">option</span><span class="p">.</span><span class="n">t38gateway</span> <span class="o">=</span> <span class="n">AST_FAX_OPTFLAG_FALSE</span><span class="p">;</span></pre></td>
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<th bgcolor="#b1ebb0" style="border-left: 1px solid #C0C0C0; border-right: 1px solid #C0C0C0;" align="right"><font size="2">3001</font></th>
<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span> <span class="k">else</span> <span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">ast_log</span><span class="p">(</span><span class="n">LOG_WARNING</span><span class="p">,</span> <span class="s">"Unsupported value '%s' passed to FAXOPT(t38gateway).</span><span class="se">\n</span><span class="s">"</span><span class="p">,</span> <span class="n">value</span><span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">The framehook should be enabled or disabled here.
Also this should accept "t38_gateway" and "gateway" as the option to set along with "t38gateway".</pre>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I have left out some comments on the implementation details, expecting them to change once everything is implemented in a framehook. Please review the asterisk wiki T.38 gateway document and my comments here and modify your implementation to match the design on the wiki. Thank you for your interest and effort surrounding this feature. If you have any questions, post them here, email me, or find me on IRC.</pre>
<p>- Matthew</p>
<br />
<p>On March 16th, 2011, 8:40 a.m., irroot wrote:</p>
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<div>Review request for Asterisk Developers, Russell Bryant, dimas, Leif Madsen, and dafe_von_cetin.</div>
<div>By irroot.</div>
<p style="color: grey;"><i>Updated 2011-03-16 08:40:59</i></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Hi there the patch that was going around circa 2008 to implement this in 1.4/1.6 app_fax has been moved to trunk [1.10]
ive made some cleanups and moved it into res_fax res_fax_spandsp this is the framework and not production code
unfortunately i have no means of testing it at the moment and require help.
i have cleaned the code up substantially it is related to R459
hope this is found useful and aids in the goal to get it in 1.10.
Adds application FaxGateway / FaxDetect
Adds alternate bridge to Dial with new option.</pre>
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<div style="margin-top: 1.5em;">
<b style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Bugs: </b>
<a href="https://issues.asterisk.org/view.php?id=13405">13405</a>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
<ul style="margin-left: 3em; padding-left: 0;">
<li>/trunk/apps/app_faxdetect.c <span style="color: grey">(PRE-CREATION)</span></li>
<li>/trunk/channels/chan_sip.c <span style="color: grey">(310546)</span></li>
<li>/trunk/channels/sip/include/sip.h <span style="color: grey">(310546)</span></li>
<li>/trunk/configs/res_fax.conf.sample <span style="color: grey">(310546)</span></li>
<li>/trunk/configs/sip.conf.sample <span style="color: grey">(310546)</span></li>
<li>/trunk/include/asterisk/channel.h <span style="color: grey">(310546)</span></li>
<li>/trunk/include/asterisk/res_fax.h <span style="color: grey">(310546)</span></li>
<li>/trunk/main/channel.c <span style="color: grey">(310546)</span></li>
<li>/trunk/res/res_fax.c <span style="color: grey">(310546)</span></li>
<li>/trunk/res/res_fax_spandsp.c <span style="color: grey">(310546)</span></li>
</ul>
<p><a href="https://reviewboard.asterisk.org/r/1116/diff/" style="margin-left: 3em;">View Diff</a></p>
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