[SIPForum-discussion] Last ACK not being forwarded

[Harbinder Singh]

Here is a scenario:
 
A SIP User Agent calls another User Agent successfully after reboot.
However, any calls after that fail. The reason being that the SIP server
is dropping the last ACK from the caller to the called party. The SIP
flow for the failure looks something like this:-
 
 
 
Upon looking at the SIP signaling information, "CallID not found"
message is found. What could be the reason for this?
 
 
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