[Asterisk-Users] Newbie: ISDN E1 the same in all countries?

[Peter Svensson]

On Fri, 11 Feb 2005, Alistair Cunningham wrote:

> 30 channel ISDN (generally known as primary rate ISDN, PRI) is a layer 
> that runs on top of E1, just as Internet Protocol can run over Ethernet.

IP is run over just about anything that passes data, serial lines, atm, 
ethernet, you name it, it has probably had ip run over it. 

Isdn on the other hand is very unusual over anything but the various BRI
configurations and E1 / T1 for PRI. Some may have multiple E1s over E3 or
some other aggregated connection, but nothing more exotic.

Peter