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Cisco Bug: CSCvh85267 - Extend SIP to ISDN message mapping to correctly handle 180 after 183 with SDP

Last Modified

Aug 09, 2019

Products (1)

  • Cisco IOS

Known Affected Releases

15.5(3)S5.1

Description (partial)

Symptom:
Early announcement message is interrupted by ringback tone.

Conditions:
Call is interworked between ISDN --(E1)--> CUBE --(SIP)--> ITSP --(E1)--> TDM.
TDM network sends ACM then CPG with alerting. 
Translation rules will result in a 183 with SDP first, followed by a 180 without SDP.
183 with SDP is converted to ALERTING with PI=8
180 without SDP is converted to ALERTING without PI
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