[Freeswitch-users] Annex B

Ken Fulmer kenfulmer at icstechnologysolutions.com
Tue May 4 15:11:43 PDT 2010

When we send calls to an Adtran gateway, our calls using g.729 work
properly. I noticed in the SDP the following field:


a=fmtp:18 annexb=yes


When we send calls to a Cisco gateway, the same call fails. 


Inbound g.729 calls coming from the Cisco gateway work properly and I
noticed the following:


a=fmtp:18 annexb=no


Is there a way to set this parameter in the dial-plan or sip profiles so we
can match what the Cisco gateway is looking for? 




Ken Fulmer


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