[Asterisk-Dev] libpri ISDN features

[Peter Svensson]

On Wed, 24 Nov 2004, Kris Boutilier wrote:

> I believe you're looking for a copy of the Q.931 standard. It should spell
> out, to the bit level, what needs to be set and how for each and every
> message. I have been looking for a copy to read up on ISDN MWI
> implementation, but haven't found a copy publicly available. The engineering
> document sources I have located are indexed at:
> http://www.voip-info.org/wiki-Telco+Engineering+Information However, unless
> you have better sources you're probably going to need to purchase a copy
> from:
> http://www.itu.int/rec/recommendation.asp?type=products&lang=e&parent=T-REC-
> Q

If you check the archives there has been some talk about itu allowing the 
download of a two or three standard documents if you give them an email 
address. 

I am not sure all messages are specified in q.931. Some are proprietary or
country specific extensions. 

Peter