I am on Asterisk 15.6.1 and still using the classic sip (not pjsip) stack. We are having our asterisk server initiate a call out to a phone through a twilio trunk. When the phone user hangs up the phone some time before the 3-minute mark of the phone call, I see that my asterisk server does receive the BYE request. However, if the phone user doesn’t hang up till after the 3-minute mark, then the BYE request is not seen by our Asterisk server. But, the twilio logs indicate that they are sending the BYE request, and in fact, they keep sending it, because they aren’t receiving a 200 response from asterisk. I do have sip logging enabled, and that logging does not indicate that Asterisk is even receiving the BYE request. So, I’m confused regarding this discrepancy, with how twilio says they are sending the BYE, but Asterisk doesn’t seem to think so, and also how the 3-minute mark of a phone call would come into play in triggering this bug.
I’ve attached a screenshot of the pcap log file, which came from twilio. As you can see in this screenshot, when the it’s more than 3 minutes on the phone call, there is no 200 from Asterisk and Twilio keeps sending the BYE. I would also send the working, less-than-3-minute pcap log, but this forum is restricting me to one screenshot
I am wondering what is so special about the 3-minute mark. Is there maybe some kind of Asterisk or network-level timeout that is occurring, perhaps?