[Asterisk-Users] Detecting Downed SIP Phone

[Eric Wieling aka ManxPower]

John Goerzen wrote:
> Hi,
> 
> I recently encountered an odd situation: the network cable to my
> SPA-841 got unplugged while it was in the midst of a call.  I got it
> re-plugged in about 30 seconds, and the phone rebooted.  The phone
> showed no evidence of the previous call in progress and worked like
> normal.
> 
> Asterisk, on the other hand, believed the call was still in progress
> -- my outgoing line was still in use, and it showed up in the "show
> channels" list.  I resorted to the "soft hangup" command to terminate
> it.
> 
> What could I do so that Asterisk would automatically terminate a call
> in these situations?

  Wait.  Asterisk will eventually realize the call is gone.  That's what 
the whole "Maximum retries exceeced" message is about.