I want to create CDR in sip proxy server.

I have a question:

Let's say UA call UB, UB send back 200OK.

1. If I set the connected time as the SIP server get the 200 Ok, how about
proxying the 200Ok to UA but failed. If I set the connected time as the SIP
server get the ACK, how about proxying the ACK to UB but failed. Also
sometimes ACK directly go between UA and UB.

SIP server forward a message does not mean another peer will receive it. SIP
server get a 200 OK does not mean this call is set up. Right?

2. BYE and BYE OK has the same issue.

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