Call session timeout interrupt

Suppose a scenario: the calling party dials the called party, the calling party is abnormally offline, the called party answers, the called party sends 200ok to vos, vos transmits 200ok to the calling party, but the calling party does not give a normal ack response, vos heavy After a few times (according to the resend mechanism set by the sip parameter), then the vos server will interrupt the traffic, and the historical CDR termination reason is the session timeout. The reference call analysis signaling is as follows:

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