Hi Nishank, A 408 Request Timeout could be coming from Clearwater (because its requests upstream are timing out) or from Zoiper (because its requests to Clearwater are timing out).
To help tell which is the case, could you turn on debug logging on Bono, by following the steps here: http://clearwater.readthedocs.io/en/stable/Troubleshooting_and_Recovery.html#bono and see if the SIP INVITE and 408 appear in Bono's logs. Then if you reproduce the problem, and send us the logs from the time of the reproduced problem (the logs are in /var/log/bono/bono*.txt) we can take a look at those and see if that shows where the problem is. Thanks, Anne.
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