[Freeswitch-users] sip_append_audio_sdp

Hi folks I am having some trouble with the sip_append_audio_sdp variable. If I set it like: <action application="bridge" data="{sip_append_audio_sdp=a=fmtp:18 annexb=no}sofia/external/sip:x@example.com"/> It seems to have absolutely no effect. I'm pretty sure I have seen it working in the past, so now I'm wondering what the prerequisites are for it to work (i.e. what am I doing wrong?!). I am using G729 in pass-through mode and have: inbound-late-negotiation [true] inbound-codec-negotiation [generous] The expected behaviour is for the value of this variable to be appended to the local SDP on the B-leg. The actual behaviour is that nothing is appended. Any thoughts? Richard