[Asterisk-Dev] PRI rejecting call without B channel

[Kevin P. Fleming]

Claude Klimos wrote:

> A little question... Is it possible using Aserisk to reject an incoming
> call with a Hangup and a PRI_CAUSE (like fast busy) without actually
> using a B channel, only at the D channel level?

Unless I'm mistaken B channels are never involved until Asterisk accepts 
and answers the call. Prior to that point all communication related to 
the call is just signalling on the D channel.