<HTML><BODY style="word-wrap: break-word; -khtml-nbsp-mode: space; -khtml-line-break: after-white-space; "><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-color: rgb(0, 0, 255); border-left-width: 2px; border-left-style: 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: 16.02px;"><B>Subject:</B></SPAN></FONT><FONT class="Apple-style-span" face="Tahoma" size="5"><SPAN class="Apple-style-span" style="font-size: 16.02px;"> Re: [asterisk-users] Codec Negotiation</SPAN></FONT><FONT class="Apple-style-span" face="Tahoma" size="5"><SPAN class="Apple-style-span" style="font-size: 16.02px;"><BR style=""></SPAN></FONT><FONT class="Apple-style-span" face="Tahoma" size="5"><SPAN class="Apple-style-span" style="font-size: 16.02px;"><BR style=""></SPAN></FONT></DIV><BR style=""><DIV style=""><DIV style="">On Jul 20, 2006, at 10:16 AM, Douglas Garstang wrote:</DIV><BLOCKQUOTE type="cite"><DIV style=""><SPAN class="810300317-20072006"><FONT class="Apple-style-span" color="#0000FF" face="Arial" size="5"><SPAN class="Apple-style-span" style="font-size: 16.02px;">I'm a little confused about Asterisk codec negotiation. Hopefully someone can help.</SPAN></FONT></SPAN></DIV><DIV style=""><SPAN class="810300317-20072006"></SPAN> </DIV><DIV style=""><SPAN class="810300317-20072006"><FONT class="Apple-style-span" color="#0000FF" face="Arial" size="5"><SPAN class="Apple-style-span" style="font-size: 16.02px;">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 style=""><SPAN class="810300317-20072006"></SPAN> </DIV><DIV style=""><SPAN class="810300317-20072006"><FONT class="Apple-style-span" color="#0000FF" face="Arial" size="5"><SPAN class="Apple-style-span" style="font-size: 16.02px;">My sip.conf has:</SPAN></FONT></SPAN></DIV><DIV style=""><SPAN class="810300317-20072006"></SPAN> </DIV><DIV style=""><SPAN class="810300317-20072006"><FONT class="Apple-style-span" color="#0000FF" face="Arial" size="5"><SPAN class="Apple-style-span" style="font-size: 16.02px;">[general]</SPAN></FONT></SPAN></DIV><DIV style=""><SPAN class="810300317-20072006"><FONT class="Apple-style-span" color="#0000FF" face="Arial" size="5"><SPAN class="Apple-style-span" style="font-size: 16.02px;">allow=ulaw</SPAN></FONT><FONT class="Apple-style-span" color="#0000FF" face="Arial" size="5"><SPAN class="Apple-style-span" style="font-size: 16.02px;"><BR style=""></SPAN></FONT><FONT class="Apple-style-span" color="#0000FF" face="Arial" size="5"><SPAN class="Apple-style-span" style="font-size: 16.02px;">allow=g729</SPAN></FONT></SPAN></DIV><DIV style=""><SPAN class="810300317-20072006"><FONT class="Apple-style-span" color="#0000FF" face="Arial" size="5"><SPAN class="Apple-style-span" style="font-size: 16.02px;">...</SPAN></FONT></SPAN></DIV><DIV style=""><SPAN class="810300317-20072006"><FONT class="Apple-style-span" color="#0000FF" face="Arial" size="5"><SPAN class="Apple-style-span" style="font-size: 16.02px;">[slow-phone]</SPAN></FONT></SPAN></DIV><DIV style=""><SPAN class="810300317-20072006"><FONT class="Apple-style-span" color="#0000FF" face="Arial" size="5"><SPAN class="Apple-style-span" style="font-size: 16.02px;">allow=g729</SPAN></FONT></SPAN></DIV><DIV style=""><SPAN class="810300317-20072006"><FONT class="Apple-style-span" color="#0000FF" face="Arial" size="5"><SPAN class="Apple-style-span" style="font-size: 16.02px;">allow=ulaw</SPAN></FONT></SPAN></DIV><DIV style=""><SPAN class="810300317-20072006"></SPAN> </DIV><DIV style=""><SPAN class="810300317-20072006"><FONT class="Apple-style-span" color="#0000FF" face="Arial" size="5"><SPAN class="Apple-style-span" style="font-size: 16.02px;">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 style=""><SPAN class="810300317-20072006"></SPAN> </DIV><DIV style=""><SPAN class="810300317-20072006"><FONT class="Apple-style-span" color="#0000FF" face="Arial" size="5"><SPAN class="Apple-style-span" style="font-size: 16.02px;">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 style=""><SPAN class="810300317-20072006"></SPAN> </DIV><DIV style=""><SPAN class="810300317-20072006"><FONT class="Apple-style-span" color="#0000FF" face="Arial" size="5"><SPAN class="Apple-style-span" style="font-size: 16.02px;">I guess the settings in [slow-phone] aren't overriding the settings in [general]. That's bad...</SPAN></FONT></SPAN></DIV><DIV style=""><SPAN class="810300317-20072006"><FONT class="Apple-style-span" color="#0000FF" face="Arial" size="5"><SPAN class="Apple-style-span" style="font-size: 16.02px;">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 style=""><BR style=""></DIV><DIV style="">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 style=""><BR class="khtml-block-placeholder"></DIV><DIV style="">I remember reading this described somewhere, but can't find the docs at the moment.</DIV><DIV style=""><BR class="khtml-block-placeholder"></DIV><DIV style="">HTH,</DIV><DIV style="">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><DIV><BR class="khtml-block-placeholder"></DIV></BODY></HTML>