[Asterisk-Users] DID trunks -- equipment requirement

[Don Pobanz]

On Monday, December 22, 2003 3:40 PM, john lawler 
[SMTP:maillist at tgice.com] wrote:
> Hi guys,
>
> I posted a somewhat similar question about a month ago and got a
> thoughtful resonse from Steven Critchfield, but I've got a quick
> follow
> up question to it.
>
> I'm looking to setup a 16 extension / 10-14 phone line Asterisk
> install
> for a customer who would like to have DID numbers for the extensions,
>
> since they're currently on Centrex and already have the 1-to-1
> correspondence.  Since I'm in a less populated area of the country,
> SBC
> doesn't seem to have much in the way of fractional T1 products (on 
the
>
> scale that we need them) available,

Have you asked for a full T1 but with just 10-14 DID/DOD trunks? We can 
not get fractional T1 here but on a full T1 we can add anywhere from 1 
- 24 trunks. So we pay one amount per month for the T1 and on top of 
that we pay another amount times the number of trunks we have.

I know this didn't exactly address your questions. For your primary 
question I believe that your would need different type of channels in a 
channel bank than FXOs. DPTs (Dial pulse) terminating come to mind, but 
that may be wrong.

Don Pobanz

>so I think my only option for DID
> is
> to use (analog) DID trunks for incoming calls and POTS lines for
> outbound calls.
>
> I'm familiar w/ POTS lines and have already done limited testing w/ a
> CAC channel bank equipped with FXO cards and that works fine.  What
> I'm
> concerned about is the DID trunks.  I've been told they have no
> dialtone
> and of course you can't place calls on them, but can receive calls.
>
> My question is, in general, should my CAC channel bank w/ the FXO
> cards
> that work on POTS lines work okay w/ analog DID trunks from the phone
>
> company?  Might I have to purchase additional equipment to handle the
>
> DIDs (going into one of two Digium T1 cards I have in the Asterisk
> box)?  Would they be different cards to plug into the CAC channel
> bank?
> Something totally different?
>
> Sorry to bring what I know is a rather off-topic question here, but
> the
> SBC guys don't like to help with customer education so much.  As
> always,
> I appreciate all of your expertise and patience with me and the other
>
> new guys.
>
> John Lawler