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<p class=MsoNormal>Hi List,<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>We have a major issue while broadcasting DTMF using meetme
application. We are sending DTMF to asterisk using SIP INFO message with
duration 160. <o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>INFO sip:xxx@xxx SIP/2.0<o:p></o:p></p>
<p class=MsoNormal>Via: SIP/2.0/UDP xxx:5060<o:p></o:p></p>
<p class=MsoNormal>From: <sip:xxx@xxx>;tag=43<o:p></o:p></p>
<p class=MsoNormal>To: <sip:xxx@xxx>;tag=9753.0207<o:p></o:p></p>
<p class=MsoNormal>Call-ID: xxx@xxx<o:p></o:p></p>
<p class=MsoNormal>CSeq: 25634 INFO<o:p></o:p></p>
<p class=MsoNormal>Content-Length: 26<o:p></o:p></p>
<p class=MsoNormal>Content-Type: application/dtmf-relay<o:p></o:p></p>
<p class=MsoNormal>Signal= 2\r\n<o:p></o:p></p>
<p class=MsoNormal>Duration= 160\r\n<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D'>[Nov
19 15:30:43] [1;32mDEBUG[0m[2966]:[1;37mchan_sip.c[0m:[1;37m24896[0m
[1;37mhandle_incoming[0m: **** Received INFO (13) - Command in SIP INFO<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D'>Receiving
INFO!<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D'>*
DTMF-relay event received: 2<o:p></o:p></span></p>
<p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D'>[KCentos-2*CLI>
[0K[Nov 19 15:30:43] [[1;32mDTMF[[0m[17988]:
[[1;37mchannel.c[[0m:[[1;37m3978[[0m [[1;37m__ast_read[[0m: DTMF end '2'
received on SIP/16222-00000037, duration 160 ms<o:p></o:p></span></p>
<p class=MsoNormal><b><span style='font-family:"Courier New";color:#1F497D'>M[[KCentos-2*CLI>
M[[0K[Nov 19 </span></b><b><span style='font-family:"Courier New";color:#C0504D'>15:30:43</span></b><b><span
style='font-family:"Courier New";color:#1F497D'>] [[1;32mDTMF[[0m[17988]:
[[1;37mchannel.c[[0m:[[1;37m4004[[0m [[1;37m__ast_read[[0m: DTMF begin
emulation of '2' with duration 160 queued on SIP/16222-00000037<o:p></o:p></span></b></p>
<p class=MsoNormal><b><span style='font-family:"Courier New";color:#1F497D'>[Nov
19 </span></b><b><span style='font-family:"Courier New";color:#C0504D'>15:30:45</span></b><b><span
style='font-family:"Courier New";color:#1F497D'>] [[1;32mDTMF[[0m[17988]:
[[1;37mchannel.c[[0m:[[1;37m4096[[0m [[1;37m__ast_read[[0m: DTMF end emulation
of '2' queued on SIP/16222-00000037<o:p></o:p></span></b></p>
<p class=MsoNormal><span style='font-family:"Courier New";color:#1F497D'>[Nov
19 15:30:45] [[1;32mDEBUG[[0m[17988]: [[1;37mchan_sip.c[[0m:[[1;37m3328[[0m
[[1;37m__sip_xmit[[0m: Trying to put 'INFO <a href="sip:18">sip:18</a>' onto
UDP socket destined for 132.186.230.236:6372<o:p></o:p></span></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>From the above log (<b><span style='font-family:"Courier New";
color:#1F497D'>Nov 19 </span></b><b><span style='font-family:"Courier New";
color:#C0504D'>15:30:43 and </span></b><b><span style='font-family:"Courier New";
color:#1F497D'>Nov 19 </span></b><b><span style='font-family:"Courier New";
color:#C0504D'>15:30:45</span></b><b><span style='font-family:"Courier New";
color:#1F497D'>)</span></b>I can see that after receiving SIP INFO asterisk is
trying to regenerate the DTMF tone based on the duration specified by the
client. Which is OK, but latency observed in this operation is more than 2 Sec
in some cases and also asterisk changes the duration field in SIP INFO message
body. Please help us out to overcome this problem as more than 2 sec latency is
not acceptable in real-time scenarios. Also if possible let us know
(technically), whether it is a know issue in asterisk.<o:p></o:p></p>
<p class=MsoNormal><o:p> </o:p></p>
<p class=MsoNormal>Regards<o:p></o:p></p>
<p class=MsoNormal>Rajib<o:p></o:p></p>
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