[Asterisk-Dev] libpri ISDN features

[Aaron S. Joyner]

Kris Boutilier wrote:

>>-----Original Message-----
>>From: Clint Guillot [mailto:clint at helixsystems.com]
>>
>>My application requires access to some of the ISDN features 
>>not present in the current libpri. I would like to start 
>>working on some of these features, but have two questions:
>>
>>Where can I find definitive information on the content of 
>>ISDN Facility messages? 
>>    
>>
>
>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 register with the ITU's website, you can obtain 3 free ITU 
specifications at no charge.  I discovered this when I was looking for 
exactly the same Q.931 spec.  Since the registration is pretty painless, 
it's a good way to acquire a free copy of the spec for educational / 
open source use.

Happy Hunting!

-- 
Aaron S. Joyner
System Administrator
Intrex.net Internet Services
(919) 573-5488 x102