Abhishek,
On 5/23/18 7:15 AM, Abhishek wrote:
Hello,
SS7 Switch —> Gateway Switch —> SIP SBC
Call flow is as mentioned.
SIP call gets established between Gateway Switch node and SIP SBC node.
Gateway Switch node initiates Re Invite without SDP.
SIP SBC node responds with 200 OK along with SDP keeping all fields same as
previous 200 OK including ‘sess-version’ field.
Gateway Switch node acknowledge this message with ACK without SDP.
SIP SBC node sends BYE to this response and mentions Reason as cause=488, No
answer to offer.
Would like to understand way forward for resolution of this issue.
While the details are sketchy, IIUC then the Gateway Switch is clearly
in error - it is required to include answer SDP in the ACK.
Thanks,
Paul
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