<div dir="ltr">Hi, <br><br>I'm experiencing some issues when using Asterisk as a gateway between 3G and SIP clients.<br>I'm trying to complete a call using h263p as the video codec on the sip client in order to avoid video transcoding.<br>
For audio I'm using AMR on the 3G side and g711 on the SIP side since most SIP clients don't support AMR out of the box.<br><br>For some phones this works without a problem while other phones don't seem to show video depending on the SIP client.<br>
For example: N73 works with X-Lite, but not with OpenPhone. N95 works with both.<br>I've traced this down to an issue with the capability exchange, specifically how capabilities are translated from h245 to SIP.<br><br>
Can someone point to which part of the code, Asterisk or libh324M does the mapping between capabilities?<br>After reviewing some relevant RFCs and specs, it is not clear to me what the 1:1 mapping should be - is there any relevant documentation?<br>
<br>Thanks,<br>Dan<br><br><br></div>