asterisk users - Jan 2006 - E1 with CAS but no call signalling?

I'm investigating an application which the client says uses an E1 trunk
with 30 voice channels and a D channel on 16 as normal, but without any
call signalling on the D channel.

In other words, as soon as I originate an outgoing call to a Zap channel
on the E1, the call immediately succeeds (is considered answered) and
passes audio in and out on the specified channel. Obviously there will be
no such thing as an incoming call or a remotely initiated hangup.

Is this possible using one of the existing signalling types? I don't
understand the meaning of many of the types listed in zapata.conf.

If not, does anyone have any pointers on what would be required to
add a new signalling type with the behaviour described?

Thanks in advance
Tony
-- 
Tony Mountifield
Work: tony@softins.co.uk - http://www.softins.co.uk
Play: tony@mountifield.org - http://tony.mountifield.org

Tony Mountifield wrote:
> In other words, as soon as I originate an outgoing call to a Zap channel
> on the E1, the call immediately succeeds (is considered answered) and
> passes audio in and out on the specified channel. Obviously there will be
> no such thing as an incoming call or a remotely initiated hangup.
> 
> Is this possible using one of the existing signalling types? I don't
> understand the meaning of many of the types listed in zapata.conf.
I don't think so. All of them assume some sort of coordinated signaling 
between the two ends.

If the other end is going to ignore the signaling bits anyway, then you 
might be able to use one of the simpler modes like FXSLS... it'd be 
worth a try anyway.