I have a customer who is reporting continued ringing even after the destination phone picks up. I’ve gotten the following information from him about the symptoms, everything on his configuration seems normal, we do not have this problem with anyone else.
Does this happen with every call or just some? JUST SOME. SEEMS TO BE AT BUSINESSES WITH MULTIPLE LINES.
Does this happen when you call out or when others call in? ONLY NOTICEABLE WHEN I AM CALLING OUT
Does the ringing stop after a certain number of seconds/rings? NO. IT INTERFERES WITH THE CONVERSATION
Do both ends of the call hear the ringing or just one side? I THINK ONLY MY SIDE HEARS IT. A COUPLE HAVE SAID THAT MY TALK COMES AND GOES WITH WHAT I HEAR AS THE PHONE RINGING ON THE OTHER END.
Downstream would be you call a SIP provider, and they interface to ISDN, leading to a final exchange using an analogue line, although it would also include ATA cases.
The phone doesn’t stop ringing when the handset is picked up, that is a fault in the phone. If you mean ringback tone doesn’t stop, that is probably a firewall or NAT problem causing the 200 OK not to reach Asterisk. In the latter case use sngrep and pjsip set logger on, etc. to find out where things are breaking.