(Cisco VoIP) PGW Softswitch SIP OK SDP towards ACE SBC media address mismatch

5 pts.
Tags:
RTP
SIP
VoIP
Fault: During the setup of some calls (approx. 1 in 600) a SIP invite is sent from the customer towards the SBC and eventually towards the PGW.  The PGW after the expected messages responds with a SIP OK towards the SBC with SDP containing the info for the remote media endpoint (in this case a Cisco MGX VXSM blade).  Packet captures have shown the address that is sent out of the PGW and towards the SBC is what is expected.  However, the SBC shows a different value and therefore the media stream is not set up correctly. All the PGWs involved in the signalling all agree on one IP address and port number so it is only the SBC that is incorrect.  MGCP at the media gateway shows the correct IP and port. Signalling ********* Customer IP Phone (SIP or SCCP) --> CUBE (SIP) --> MPLS WAN --> ACE SBC (SIP) --> PGW (EISUP) --> PGW (EISUP) --> PGW (ISUP IP protocols) --> SLT Expected media ******** Cust IP Phone --> CUBE --> ACE SBC --> MGX VXSM --> PSTN PGW Output ***********    "sippath- 1:CID=0704f84356ea61edd6b1e670d9cf5d73@10.16.248.65,CALL=IN,MediaIPAddr=10.16.248.65,MediaPort=16752 "    "sippath-1:Mate_SigPath=pgw-path,MediaIPAddr=62.239.226.121,MediaPort=23198" ACE SBC Output ************     Side B:       Name:                             No media timeout remaining: 221 s       Reserved Bandwidth:         9828 (bytes/second)       Status:                     In Service       VRF Name:                   XXX-core-context01       Local Address:              10.16.248.65       Local Port:                 16752       Remote Address:             193.113.98.25       Remote Port:                26966       RTP Packets Received:       18646       RTP Packets Sent:           19197       RTP Packets Discarded:      0       RTP Data Received:          5220880 (bytes)       RTP Data Sent:              5375160 (bytes) The main question is has anyone seen this before?

Software/Hardware used:
Cisco PGW Softswitch Version:9.7(3) CSCOgs026/CSCOnn026 & ACE SBC loader: Version 12.2[123] system: Version 3.0(1)AS31(2)

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