[Asterisk-Users] Re: T1 questions follow-up

[Brian C. Fertig]

Sorry I felt left out..  :)


-----Original Message-----
From: asterisk-users-bounces at lists.digium.com [mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Michaël Gaudette
Sent: Thursday, October 20, 2005 2:37 PM
To: asterisk-users at lists.digium.com
Subject: [Asterisk-Users] Re: T1 questions follow-up

Tom, Thank you!  This was all hypothetical, because I'm trying to wrap my 
mind around the concept.  But you've made it much clearer for me.  I still 
have a few follow-up questions...

1a) Forget the hypothetical company now.  Let's say 6 outside lines were 
deemed sufficient, and there were 12 employee (i.e. inside lines).  Could I 
have the same Digium T1 card to service out and inside the company?

   Yes.  You can order a T1 ISDN PRI from most carriers and they can limit the circuit amount on the T1.

1b) I'm fairly certain of this, but anything going outside, I could use the 
same T1 for receiving calls as for sending them, right? (not with the same 
channel at the same time, obviously, but I could use 2 lines incoming and 4 
outgoing, or 3 incoming and 3 outgoing, depending on the current situation, 
without reconfigurin the PBX?)

   Yes you have to tell them that you want a Bi-Directional PRI.  Yes.  You would use the group feature for Zaptel.  The call would be something like:
   dial(ZAP/g1)  this would take the next channel available and send it out.

2) When you say a PRI is necessary for a Caller-ID name (as opposed to just 
number), I've looked around and I understand a PRI uses a T1 tunnel (24 
channels) but a bit more expensive.  Is this a fact, or is it something 
completely separate that I couldn't use with Asterisk? Or am I completely 
out in left field?

    What you want to order is ISDN PRI NI signaling.  CAS will not cut it for you.  Yes.  Normally you would have 24 channels in a T1.  However they can fraction it off for you with 1 D channel and X amount of B channels.



..o-------------------------------------------------------o..
Brian Fertig
Network/Systems Engineer
IT Administrator
Planet Telecom, Inc.
Tampa,FL Office


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