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843e4953be
As per RFC4856, Annex B mode for G.729 is disabled if the SDP contains a fmtp parameter annexb=no and enabled if annexb=yes or the annexb parameter is missing. When responding to an offer mod_sangoma_codec always returns an answer without a fmtp parameter. Even in response to a SDP offer which contains one. This has the effect of responding to a request to disable Annex B with an answer that only Annex B is supported. With this change mod_sangoma_codec copies the fmtp parameter from the offer to the answer fixing the problem.