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? WARNING-FRAUDULENT FUNDING INSTRUCTIONS Email hacking and fraud are on the rise to fraudulently misdirect funds. Please call your escrow officer immediately using contract information found from an independent source, such as the sales contract or internet, to verify any funding instructions received. We are not responsible for any wires sent by you to an incorrect bank account.