atcomsystems.ca/forum Forums Wiring - Telecom Carriers - Trunks & Services T1's, CSU's and DSU's Question re: plain T1 and caller ID

Have a customer with a plain voice T1 (not PRI). When they make an outgoing call the receiving end gets an "unknown caller" ID. Verizon says this is the way it works. Is this true? Also, can my customer receive caller ID on this T1??
Thanks

The provider at your customers place sends out the number on outgoing calls. The provider at the called location looks up that number in their database and provides it to the called location. That's how it works.

If the called location provider has "Unknown Caller" as the name for that number---then that's what is going to be displayed. Some providers don't make any changes in their database for years. Also, some providers want extra $$ to provide a name. If that called location has refused to pay that fee---then that's what they're going to get for all of the incoming calls---"Unknown Caller".

Somewhat educated guess: A plain old T1 contains 24 channels each at 64kbps availible for data or voice. There is no extra bandwidth availible for extra services like caller ID presentation. A PRI has 23 channels for voice or data and 1 signalling channel to handle signalling functions and extra things possible like caller ID for the 23 channels.

PS: I haven't seen too any PBX's using anything but PRI's.

In cases where trunks are T1E&M, loop or ground start, the LEC can assign an ANI to the trunk group in the Central Office switch and forward it along on originating calls. The terminating switch would check the database for the name associated with the ANI and pass it along to the called party.

Thanks for the input. The service is Verizon, customer's PBX is a Panasonic KX-T1232 rev 4. Looks like it is time for an upgrade to PRI, or maybe SIP trunks

Contrary to popular belief, each channel of a T1 has room for the CID. Remember, it's only presented between the 1st and 2nd ring (and again between 2 other rings 7 & 8?). It requires no overhead data space, it's sent as a modem signal @ 1200 (?) baud. You can hear it with a buttset in monitor mode. HOWEVER, most LECs don't want to mess with it! When we run a PRI to an old Mitel D, we convert it to a T1 with an Asterisk machine at the customer site. And then feed it to the Mitel T1 card. No not a trunk card, a T1 card. And yes, the Mitel 15/16 will display CID on the console. CID works just fine if you provision everything correctly. You must, however, disable trunk 24 on the T1, because there are only 23 on the PRI.
However, sending the CID out will have to be done by the Asterisk, if the Provider won't attach it. In addition, I have been told that there are 2 different CID transmission schemes and not all LECs are willing to deal with both. True, beats me? Maybe someone else knows for sure!

"Back in the day" There was no CID on T-1 UNLESS you had MCI. They had a standard and you could have ANI which is similar to CID. So, Lightninghorse is correct in that there is plenty of bandwidth for the CID data, however, the way Telcos tariff their products, they will never provision CID or ANI on T-1 when they have it on PRI.

Rcaman

With that Panasonic key system you have POTS trunks so there has to be a channel bank owned by probably Verizon someplace. You could just leave the system as is and upgrade to PRI. But I don't believe the 1232 is CID capable (or is there an add on module for it, been a long time).

-Hal