[asterisk-users] Asterisk not hanging up

[Ed W]

I have a problem with calls not hanging up if for some reason the 
physical phone dies or gets unplugged

I can demonstrate this in practice by making a call from a handset, then 
unplugging the handset from the power.  The call remains active and 
asterisk never seems to disconnect it. 

More annoyingly when power is re-applied the handset comes back to life, 
won't receive incoming calls (because asterisk thinks it's busy), but 
likewise the handset itself doesn't think it's in a call so it can't 
retrieve the call or do a proper hangup.

I have no NAT in place and the handsets are all set to register/login 
and "qualify=yes" set (which I had hoped would sort this...)

The handsets are SNOM 360s but I don't think this is directly relevant.  
Asterisk is setup to use FreePBX dialplan (but again don't think this 
is relevant?)

Can someone please suggest a way to ensure that the calls get hungup - 
we had a 9 hour call earlier before someone noticed.... It's rare, but 
the consequences are potentially quite dire.


Cheers

Ed W