I use it over UDP and the SIP transaction setup does the job perfectly. The problem is when you use it over mobile networks and do network switching (eg. from WiFi to LTE) and at that instance when an OPTIONS message goes out; it goes out to the WiFi IP Address from where the request is bound to timeout as we have already switched or in process of switching to LTE.
The kamailio will then try to close this call as no response was received. Thus, the suggestion was to have some configurable number of consecutive timeouts before sending out the BYE.

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