[Asterisk-Dev] PRI/Zap

[Tais M. Hansen]

On Wednesday 04 May 2005 14:11, Peter Svensson wrote:
> > Also, my provider told me that we were always using "explicit" when
> > choosing channels, instead of "preferred", which they recommend. I
> > haven't looked into that yet, so I can only guess what it means. I have a
> > feeling it's closely related.
> The problem is that Asterisk treats a PRI link like a lot of independant
> channels which happen to share a signalling channel. Asterisk will first
> select a B-channel for a call and then use that channel in the setup
> message.
>
> The net end is free to reject a specific B channel. Most telecom cpe
> equipment leave the B-channel selection to the net end, or is at least
> capable of retrying using a different channel. Unfortunatly this is not
> possible to implement with the current zap channel implementation in
> Asterisk.

That's very bad news.

Do you (or someone else on this list) know where Asterisk chooses the what 
B-channel to use? I'm thinking about hacking this to use random channels or 
at least do round-robin instead of what seems like fifo. Then I could make 
some dialanswer/cause check in the dialplan to retry the call. I believe that 
would work.

-- 
Regards,
Tais M. Hansen
ComX Networks A/S
Tel: +45-70257474
Fax: +45-70257374
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