I’m having a strange issue with Asterisk 13.17.2 and pjproject-2.7.

I have one extension that will occasionally end up in a “Zombie” channel and stop receiving calls.  (Note that the console never says “Zombie” it just shows a channel that can’t be hung up.

Here’s an excerpt from a console session showing the problem:

cameronpbx*CLI> core show channels concise PJSIP/15-000000e9!internal!s!1!Up!AppQueue!(Outgoing Line)!s!!!3!12616!!1520615616.690
cameronpbx*CLI> hangup request all                PJSIP/15-000000e9  DAHDI/2-1
cameronpbx*CLI> hangup request PJSIP/15-000000e9
PJSIP/15-000000e9 is not a known channel cameronpbx*CLI> hangup request “PJSIP/15-000000e9”
PJSIP/15-000000e9 is not a known channel cameronpbx*CLI> hangup request DAHDI/2-1
DAHDI/2-1 is not a known channel cameronpbx*CLI> hangup request all cameronpbx*CLI> hangup request all

When it gets in this state, I can’t even do a “core restart when convenient” as it will sit there and wait forever for that channel to disappear.  I have to drop to a command line and do a “systemctl restart asterisk” to get it to reset that extension.  The really strange thing is it never happens to any other extensions on the system.  Just that one phone.

Any ideas?
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