[Asterisk-Users] DID Trunk Lines and Caller ID

[Steven Critchfield]

On Mon, 2004-01-05 at 10:35, Jared Smith wrote:
> On Mon, 2004-01-05 at 09:04, Steven Critchfield wrote:
> > On Mon, 2004-01-05 at 09:28, Michael at matraex.com wrote:
> > > I have an installation which is currenly using 14 DID Trunk Lines.  I
> > > need to be able to use Caller ID information and currently it is not
> > > available on these lines.
> > > Is there another way to access this information?
> > 
> > Convert to PRI. 
> > 
> > While I am sure it is possible to order CallerID on a DID trunk, it
> > sometimes is dependent on software revisions in the CO as to whether or
> > not they can support it. We had this problem once. PRI will get you both
> > called number(DID) but also the calling number all sent in the D channel
> > so you should have nice fast answers if you choose.
> 
> Some long distance providers provide the information on the channel,
> usually as *DNIS*ANI* or *ANI*DNIS*... I currently get something like
> *16665551212*17775551213*.
> 
> It's not as slick as PRI, but it's often a lot less expensive.

The other thing to know about that is the time it takes to transmit the
information. When moving from a channelized T1 with 4 digits of DID to a
PRI, we had enough of a difference in time in call connect that our
customers commented on it. So if 4 digits of DTMF is noticeable, do you
think 23 digits would be? Maybe cheaper, but you still have to watch
time till connected.
-- 
Steven Critchfield  <critch at basesys.com>