[Asterisk-Dev] PRI rejecting call without B channel

Paul Cadach paul at odt.east.telecom.kz
Fri Jul 30 09:31:22 MST 2004


As specified in all PRI-related documentation, at most cases B channel is reserved and its number passed together with
SETUP message. Also, ringback tone at selected B channel must be provided immediately when SETUP ACK is sent out. So, I
don't think you can provide regular call handling without allocation/reservation of B channel.


----- Original Message -----
From: "Kevin P. Fleming" <kpfleming at backtobasicsmgmt.com>
To: <asterisk-dev at lists.digium.com>
Sent: Friday, July 30, 2004 11:09 PM
Subject: Re: [Asterisk-Dev] PRI rejecting call without B channel

> 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.
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