[Asterisk-Users] isdn out of band signalling

[Michael Neuhauser]

On Wed, 2006-03-15 at 14:01 +1100, James Harper wrote: 
> This is more an isdn question than an asterisk specific one, but is
> there any end to end signalling channel available during call setup? Eg
> if AParty dials BParty, can any information be conveyed (in both
> directions preferably, and in addition to CLI[PR]) before the call is
> answered?

The USER-USER information element of Q.931 might do the trick, but
support for that is still disabled in Asterisk 1.2.5 (look for
SUPPORT_USERUSER in chan_zap.c). Maybe it works with one of the
dedicated isdn channel modules.
-- 
Dr. Michael Neuhauser                phone: +43 1 789 08 49 - 30
Firmix Software GmbH                   fax: +43 1 789 08 49 - 55
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