Posted: Sun May 27, 2007 8:47 pm Post subject: [Asterisk-video] Fix on video codec negociation
Since Asterisk 1.4, I experienced two incorrect behavior in regards with SIP & video support on Asterisk:
Calls fail between SIP phone sharing one video codec and distinct audio codec.
200 OK returns several audio and video codecs
Am I the only one ?
I spent the weeking reading the code and testing and submitted a patch to Digium that correct this. Here it is: http://bugs.digium.com/view.php?id=9815 Feedback is welcome.
I have the feeling that the way codec is handled by Ast is wrong in the specifications. Here are my analysis
If Asterisk is used to
If Asterisk is used as a Media Server, then the codec settings should not be dependent on the channel either but be a global setting or associated to a dialplan extention (e.g. such service sports only H.263 video prompts)
I believe that what is true with SIP is true with any signalling protocol capable of negociating codecs namely: IAX, H.323, Skinny ? and in some cases ISDN with H.324m.
Posted: Sun May 27, 2007 8:55 pm Post subject: [Asterisk-video] Fix on video codec negociation
Emmanuel BUU wrote:
Quote:
Since Asterisk 1.4, I experienced two incorrect behavior in regards
with SIP & video support on Asterisk:
* Calls fail between SIP phone sharing one video codec and
distinct audio codec.
* 200 OK returns several audio and video codecs
More explanation on the last case : if the two SIP phone share several
video codecs, then the 200 OK issued by Asterisk as answer to the caller
contains all those codecs instead of containing only the codec
negociated with the remote party.
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