asterisk users - Mar 2005 - OT: Zap channels intermittently bridging with SNOM190

Hi guys/girls,
We are running a TDM04B card with Asterisk in a Linux box that has 15
GrandStream102 extensions and 1 SNOM190 phone which we are using as an operator
console. The FXO ports in the TDM04B are plugged directly into our telecoms
provider's analogue lines.

Something I've picked up with the SNOM is that sometimes when there are two
active incoming calls via Zap channels they end up being transferred to
eachother. In other words two in bound callers end up being connected to
eachother.
I've checked with the operator and she's said that she's been
disconnecting any 'idle' calls i.e. when the remote user hangs up but
yet the problem still occurs every now and again.

This is what I end up with when I run a 'show channels':
 Channel  (Context    Extension    Pri )   State Appl.         Data
        Zap/1-1  (default                 1   )      Up Bridged Call  Zap/2-1
        Zap/2-1  (default    2009         1   )      Up Dial         
SIP/switchboard|30|tr

For reference call transferring on the SNOM is being done via the
'consultation transfer' method as set out in the SNOM manual.

Perhaps there is a way in Asterisk or the SNOM phone to prevent/disallow
bridging of specific Zap channels ?

Has anyone else come across this phenomenon before ?
Thanks in advance 

Kindest regards
David Wilson
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Hi David

On Thu, 10 Mar 2005, quoth David Wilson:
> Something I've picked up with the SNOM is that sometimes when there
> are two active incoming calls via Zap channels they end up being
> transferred to eachother. In other words two in bound callers end up
> being connected to eachother.
I've come across this exact problem.  Whenever there are two calls on hold
and you push the "transfer" button, it transfers them both together.

The solution is to go to the SNOM's webpage, and under Setup/Advanced
set "Call join on Xfer (2 calls)" to off

Why that option is enabled by default I don't know, but it caused me grief
for a couple of months until I finally discovered that option - and
even now the receptionist refuses to answer more than one call at a time,
because she's afraid to join two customers together again.

 - Matt