Question:
I am looking for a clear answer regarding the ability of a T1 that is NOT a PRI to accommodate BOTH Caller ID and DID.

I am being told that both an Avaya Magix and an IP Office MUST be connected to a PRI in order to get either of them.  I was always pretty sure that you could get at least one at a time over a regular T1.

I suppose the confusion could be related to the ability to get BOTH at the same time, and that you need the out of band signaling of a PRI D-channel to get both.

I'm so confused and I haven't even asked about the real difference between DID and DNIS or ANI and Caller ID Maybe some one could recommend a good resource for these questions that is more than just a definition but also does not need an EE degree to understand.

Answer:
Some telephone systems do have the ability to accept Caller ID information as part of the DID string.

Let's say that you have 4-digits being passed for DID .the CO would pass xxxxyyyyyyyyyy.  Where xxxx=the 4 digit DID number and yyyyyyyyyy=the caller ID information.

Your telephone system needs to have the ability to break out the digits received and identify the digits for DID routing and Caller ID information. I have worked with the Fujitsu F9600, which has this capability, but not sure of others.

In addition, you need to find a telco that will provide this service.  I have been asking Verizon to do this for a couple of years, and they will not.

I am looking for a clear answer regarding the ability of a T1 that is NOT a - PRI to accommodate BOTH Caller ID and DID.

I am being told that both an AAA Magix and an IP Office MUST be connected - to a PRI in order to get either of them.  I was always pretty sure that you - could get at least one at a time over a regular T1.

I suppose the confusion could be related to the ability to get BOTH at the - same time, and that you need the out of band signaling of a PRI D-channel to - get both.

I'm so confused and I haven't even asked about the real difference between - DID and DNIS or ANI and Caller ID Maybe some one could recommend a good - resource for these questions that is more than just a definition but also - does not need an EE degree to understand.

Technical facts:

You are using what is known in the industry as a "Channelized T1" aka CT1 - A CT1 is a "dumb" connection, emulating conventional telephone lines. - As such, only "in band" signaling (usually DTMF, sometimes MF) is available. - DNIS/DID services require the individual channels or "lines" to be   properly configured at both the phone systems and C.O.sw itch, generally   by using "wink start" or "wink-wink" signaling, as opposed to ground   start or loop start operation commonly provisioned by default. - Not all carriers and/or phone systems are prepared to configure DID/DNIS   trunks for "two way" operation, many require the CT1 to be divided up   with certain channels in the CT1 used for  an "inbound only" trunk group. - Outbound caller id is only available using a single fixed number for the   entire trunk group. In most cases, it will be marked as "UNAVAILABLE"   and the carrier or telco will swear it can't be changed. It can be, the   number is part of the central office trunk group's configuration but   it will take a great deal of work to get them to do it.

Operational considerations:

DID/DNIS/PRI signaling on a CT1 will be constrained by the type of   phone line your CT1 is configured to operate as, between your phone system   and your LEC (local phone co.) or IXC (long distance co.) - The capabilities of your telephone system will also dictate what you   can do, e.g. your phone system may or may not be able to receive CNID   via DTMF - The capabilities and willingness of your telco or carrier system will also   dictate what you do. Most telcos and carriers will not send CNID via DTMF   on CT1 but may or may not be willing to provide DID or DNIS. - In some cases, the phone system and carrier can provide the service, but   may or may not be compatible due to sequence or format incompatibilities.

What you can do:

- Talk to your phone vendor about practical considerations for adding   a DID group on your existing CT1. Ask if two way "wink-wink" start   trunks with DID and/or DNIS using inband DTMF can be accommodated. - Have the same conversation with your CT1 provider.  (Assuming you   can find someone there who knows about this. They have the   sales engineers. Ask.) - Setup a conference call with your vendor and the provider to work   out the practical aspects of getting this done.