If you receive 'g729a' or 'g729ab' in your SDP that device sending it is broken, you should file a bug with them and make them correct it. You should only be seeing 'g729', The fmtp line dictates the a vs b element of g729 not the sringing in the rtp map line. On Wed, Jun 10, 2015 at 9:27 AM, Dmitry Saratsky <simpot@gmail.com> wrote:

Yes, I'm talking about SDP. 1. If I receive in SDP call with g729ab, can I reply with g729a and then setup the call in g729?

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