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Call Trace - 183 Session Progress (F-6480)

In the call trace below, the 2020 IMG receives a 183 Session Progress message without SDP from egress or B leg of a call. The 180 Ringing Behavior field is set to 183 Session Progress w/SDP. The 183 Session Progress message is propagated and regenerated on the ingress or A leg of the call as a 183 Session Progress with SDP.

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