[Asterisk-Users] T100P PRI question

[Peter Svensson]

On Wed, 8 Dec 2004, Eric Wieling aka ManxPower wrote:

> Colin Anderson wrote:
> > Some telco's do, some telco's don't. The text "Rarely used for PRI" is IMO a
> > location-centric and carrier-centric statement. As another poster suggested,
> > PRI's are picky, and some carriers are super-picky so it's always best to
> > dot your i's and cross your t's when dealing with PRI. At worst, it will be
> > ignored by the switch. 
> 
> Actually, the worst that can happen is not being able to dial out the 
> PRI to numbers that are not "national", "local", or "international".

This is incorrect. The numbers you send must be formatted differently 
depending on what ton/npi you claim they are in. With "national" (the 
asterisk default) you can not dial internationally if the switch is set up 
according to itu specs. 

Also, a lot of switches will not accept all ton/npi combinations.

"Unknown" should really be the default. This allows you to send numbers 
the way they are dialed on a POTS line, most of the time. As a second 
option "international" is good since that allows all numbers to be dialed, 
but you will have to prefix non-intrnational numbers with your country 
code.

In the US the ton/npi seems to be used much less frequently than in the 
rest of the world. Then again US carriers seem to use isdn as a T1 with a 
little better setup/teardown. Nothing wrong with that but isdn can be a 
lot more complex/capable.

Peter