[asterisk-dev] Code hint to change ZAP behaviour

[Steve Davies]

Hi,

We have an asterisk user who has wireless phones - I believe that
these phones are causing occasional locked-up SIP channels. While this
is a problem in itself, it is not easily diagnosable, so I am looking
for a solution from a different angle.

The problem occurs when a ZAP channel hangs up, but cannot clear down
the bridged channels, presumably because of their locked-up state.
This leaves the PRI/telco thinking it has a clear channel, but
asterisk thinking it is still busy. If a new call is presented by the
telco on this channel, it is hung-up with the message:

chan_zap.c:8062 pri_dchannel: Ring requested on channel 0/2 already in
use on span 1.  Hanging up owner.

What I was hoping for was a hint as to how I could modify this code so
that it also tries to clear the "stuck" call. I cannot think of a case
where the telco sends a call in on a channel, and that channel is
in-use already that is valid, so I would like to be more harsh in the
clearing up the mess in this case.

Thanks for any pointers.
Steve