[Asterisk-Users] E1 and/or Euro-ISDN specifications?

[Peter Svensson]

On Tue, 15 Feb 2005, Daniel Nyström wrote:

> Where can I get E1 and/or Euro-ISDN specifications/data sheets?
> Are there specs for other E./G./Q./etc. protocols as well?

The specifications are built one on top of another. Each just lists the 
changes and clarifications relative to the underlaying specification. 
E.g. for the Swedish incumbent operator Telia you have:

 * Telia ISDN Notes for Suppliers
 * ETSI specifications (e.g. ETSI ETS 300 403 01 etc)
 * ITU specifications (e.g. Q.931, Q.921 and lots and lots of others)

The Telia implementation specification is free, as are the ETSI 
specification (at least for some uses). The ITU specifications are a bit 
expensive, but you can download three for free.

Most of the time the ITU specifications are at the "bottom level", but not 
always.

Peter