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SDP manipulation in 200 OK response

in Acme Packet (MOSC) Question

Hi Acme Packet HMR Community,

Wonder if you could help me with a suggestion for the formulation of a HMR that would address the following problem

When the PBX in the HOASM realm sends an INVITE request it proposes G729 with annexb=no in the SDP of its INVITE message:

m=audio 16390 RTP/AVP 18 101

a=rtpmap:18 G729/8000

a=fmtp:18 annexb=no

a=rtpmap:101 telephone-event/8000

a=ptime:30

However in the 200 OK response from the SIP trunk provider (trunk realm), it is missing sending back “annexb=no” to the CM :

m=audio 28162 RTP/AVP 18 101

a=rtpmap:18 G729/8000

a=rtpmap:101 telephone-event/8000

a=fmtp:101 0-15

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