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<DIV><SPAN class=050553918-20072006><FONT face=Arial color=#0000ff size=2>Sorry
for the top posting. My email client is misbehaving.</FONT></SPAN></DIV>
<DIV><SPAN class=050553918-20072006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=050553918-20072006><FONT face=Arial color=#0000ff size=2>Can't
use gsm. The polycom phones only support g711/ulaw and g729.</FONT></SPAN></DIV>
<DIV><SPAN class=050553918-20072006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=050553918-20072006><FONT face=Arial color=#0000ff size=2>No, we
aren't intending to check for available g729 codecs.... that's why we wanted to
have ulaw as a backup when no g729 codecs where available.</FONT></SPAN></DIV>
<DIV><SPAN class=050553918-20072006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<BLOCKQUOTE dir=ltr
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT face=Tahoma
size=2>-----Original Message-----<BR><B>From:</B> Martin Joseph
[mailto:ast@stillnewt.org]<BR><B>Sent:</B> Thursday, July 20, 2006 12:34
PM<BR><B>To:</B> Asterisk Users Mailing List - Non-Commercial
Discussion<BR><B>Subject:</B> Re: [asterisk-users] Codec
Negotiation<BR><BR></FONT></DIV><BR>
<DIV>
<DIV>On Jul 20, 2006, at 11:00 AM, Douglas Garstang wrote:</DIV>
<BLOCKQUOTE type="cite"><BR class=Apple-interchange-newline>
<BLOCKQUOTE dir=ltr
style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: rgb(0,0,255) 2px solid; MARGIN-RIGHT: 0px">
<DIV class=OutlookMessageHeader dir=ltr align=left><FONT
class=Apple-style-span face=Tahoma size=5><SPAN class=Apple-style-span
style="FONT-SIZE: 16px"><B>Subject:</B></SPAN></FONT><FONT
class=Apple-style-span face=Tahoma size=5><SPAN class=Apple-style-span
style="FONT-SIZE: 16px"> Re: [asterisk-users] Codec
Negotiation</SPAN></FONT><FONT class=Apple-style-span face=Tahoma
size=5><SPAN class=Apple-style-span
style="FONT-SIZE: 16px"><BR></SPAN></FONT><FONT class=Apple-style-span
face=Tahoma size=5><SPAN class=Apple-style-span
style="FONT-SIZE: 16px"><BR></SPAN></FONT></DIV><BR>
<DIV>
<DIV>On Jul 20, 2006, at 10:16 AM, Douglas Garstang wrote:</DIV>
<BLOCKQUOTE type="cite">
<DIV><SPAN class=810300317-20072006><FONT class=Apple-style-span
face=Arial color=#0000ff size=5><SPAN class=Apple-style-span
style="FONT-SIZE: 16px">I'm a little confused about Asterisk codec
negotiation. Hopefully someone can help.</SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=810300317-20072006></SPAN> </DIV>
<DIV><SPAN class=810300317-20072006><FONT class=Apple-style-span
face=Arial color=#0000ff size=5><SPAN class=Apple-style-span
style="FONT-SIZE: 16px">I have two phones, one on a slow link where I'd
like to use G729, and one on a fast link where I'd like to use
ulaw.</SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=810300317-20072006></SPAN> </DIV>
<DIV><SPAN class=810300317-20072006><FONT class=Apple-style-span
face=Arial color=#0000ff size=5><SPAN class=Apple-style-span
style="FONT-SIZE: 16px">My sip.conf has:</SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=810300317-20072006></SPAN> </DIV>
<DIV><SPAN class=810300317-20072006><FONT class=Apple-style-span
face=Arial color=#0000ff size=5><SPAN class=Apple-style-span
style="FONT-SIZE: 16px">[general]</SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=810300317-20072006><FONT class=Apple-style-span
face=Arial color=#0000ff size=5><SPAN class=Apple-style-span
style="FONT-SIZE: 16px">allow=ulaw</SPAN></FONT><FONT
class=Apple-style-span face=Arial color=#0000ff size=5><SPAN
class=Apple-style-span style="FONT-SIZE: 16px"><BR></SPAN></FONT><FONT
class=Apple-style-span face=Arial color=#0000ff size=5><SPAN
class=Apple-style-span
style="FONT-SIZE: 16px">allow=g729</SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=810300317-20072006><FONT class=Apple-style-span
face=Arial color=#0000ff size=5><SPAN class=Apple-style-span
style="FONT-SIZE: 16px">...</SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=810300317-20072006><FONT class=Apple-style-span
face=Arial color=#0000ff size=5><SPAN class=Apple-style-span
style="FONT-SIZE: 16px">[slow-phone]</SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=810300317-20072006><FONT class=Apple-style-span
face=Arial color=#0000ff size=5><SPAN class=Apple-style-span
style="FONT-SIZE: 16px">allow=g729</SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=810300317-20072006><FONT class=Apple-style-span
face=Arial color=#0000ff size=5><SPAN class=Apple-style-span
style="FONT-SIZE: 16px">allow=ulaw</SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=810300317-20072006></SPAN> </DIV>
<DIV><SPAN class=810300317-20072006><FONT class=Apple-style-span
face=Arial color=#0000ff size=5><SPAN class=Apple-style-span
style="FONT-SIZE: 16px">Firstly, does setting the codec for the
slow-link phone override the general settings? Of course it's not
actually documented anywhere.</SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=810300317-20072006></SPAN> </DIV>
<DIV><SPAN class=810300317-20072006><FONT class=Apple-style-span
face=Arial color=#0000ff size=5><SPAN class=Apple-style-span
style="FONT-SIZE: 16px">When the fast link phone calls the slow link
phone, it sends ulaw and G729 in that order to Asterisk. When Asterisk
relays the INVITE to the slow link phone, it does not change the codec
preference, and sends ulaw followed by G729. I end up with a call that's
ulaw on both legs, which isn't what I want.</SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=810300317-20072006></SPAN> </DIV>
<DIV><SPAN class=810300317-20072006><FONT class=Apple-style-span
face=Arial color=#0000ff size=5><SPAN class=Apple-style-span
style="FONT-SIZE: 16px">I guess the settings in [slow-phone] aren't
overriding the settings in [general]. That's
bad...</SPAN></FONT></SPAN></DIV>
<DIV><SPAN class=810300317-20072006><FONT class=Apple-style-span
face=Arial color=#0000ff size=5><SPAN class=Apple-style-span
style="FONT-SIZE: 16px">How can I work around
this?</SPAN></FONT></SPAN></DIV></BLOCKQUOTE>As you already stated in your
previous post the slow phone codec pref does override general when it's
the caller.<BR><BR></DIV>
<DIV>I think the calling parties codec preferences are respected.
That is why I suggested the last time you posted this that you "force" the
slow link to g729 (allow that only), as that will cause the calling party
(fast) to choose g729 also...</DIV>
<DIV><BR class=khtml-block-placeholder></DIV>
<DIV>I remember reading this described somewhere, but can't find the docs
at the moment.</DIV>
<DIV><BR class=khtml-block-placeholder></DIV>
<DIV>HTH,</DIV>
<DIV>Marty</DIV></BLOCKQUOTE></BLOCKQUOTE>
<DIV><BR class=khtml-block-placeholder></DIV>
<DIV><BR class=khtml-block-placeholder></DIV><BR
class=Apple-interchange-newline>
<BLOCKQUOTE type="cite">
<DIV><SPAN class=050595817-20072006><FONT face=Arial color=#0000ff
size=2>Marty,</FONT></SPAN></DIV>
<DIV><SPAN class=050595817-20072006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=050595817-20072006><FONT face=Arial color=#0000ff
size=2>Ahhh.... I wasn't thinking about the fact that it would be keyed of
the callers settings, rather than the callee's.</FONT></SPAN></DIV>
<DIV><SPAN class=050595817-20072006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV>
<DIV><SPAN class=050595817-20072006><FONT face=Arial color=#0000ff
size=2>However, setting the slow-link phone to g729 isn't a very workable
solution. We want to have ulaw as a backup, in case all of our g729 licenses
are in use. Having the call completely fail in this case would be very bad.
We should be able to have the slow-link phone negotiate to
ulaw.</FONT></SPAN></DIV>
<DIV><SPAN class=050595817-20072006><FONT face=Arial color=#0000ff
size=2></FONT></SPAN> </DIV></BLOCKQUOTE><BR></DIV>
<DIV>Are you intending to implement some logic to check for available g729
codecs? Because asterisk doesn't do this for you... </DIV>
<DIV><BR class=khtml-block-placeholder></DIV>
<DIV>What about using some form of unrestricted codec like GSM instead for the
slow link?</DIV>
<DIV><BR class=khtml-block-placeholder></DIV>
<DIV>Don't know any great solutions for you...</DIV>
<DIV>Marty</DIV>
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