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oozenoz · April 27th, 2006, 03:33 PM

TIE and T1 are NOT the same!

The service references can get confusing, and as a result, can often cause errors when attempting to set up systems. T1 refers to the facilities, not the service.

Tie lines are (mostly) T1 or E1 spans that connect (or 'tie') PABX systems or sites together. Avaya uses the term TIE in their provisioning to refer to the type of service provided by the trunks... it adds a layer of complexity and confuses the heck out of a lot of people.

Here's what you need to understand about voice services and CPN presentation:

ISDN and QSIG both support voice and run on T1 facilities. These protocols are feature-rich - QSIG provides the ability to transfer and drop calls between systems, while both allow you to provide calling party number information. It is possible to use ISDN or QSIG protocol on tie trunks (those that connect private voice systems without going through the PSTN); however you have to be very careful when filling out the forms on the PBX....

IF the tie span between nodes A and B is loop start, ground start, or E&M wink, no CPN information can be passed. No more than it could be if you used any of these protocols on your local trunks to telco.

April 27th, 2006, 03:33 PM	#10 (permalink)
oozenoz PBXtech PLATINUM 300+ posts Join Date: Feb 2006 Posts: 350	Re: where to set CPNumber? TIE and T1 are NOT the same! The service references can get confusing, and as a result, can often cause errors when attempting to set up systems. T1 refers to the facilities, not the service. Tie lines are (mostly) T1 or E1 spans that connect (or 'tie') PABX systems or sites together. Avaya uses the term TIE in their provisioning to refer to the type of service provided by the trunks... it adds a layer of complexity and confuses the heck out of a lot of people. Here's what you need to understand about voice services and CPN presentation: ISDN and QSIG both support voice and run on T1 facilities. These protocols are feature-rich - QSIG provides the ability to transfer and drop calls between systems, while both allow you to provide calling party number information. It is possible to use ISDN or QSIG protocol on tie trunks (those that connect private voice systems without going through the PSTN); however you have to be very careful when filling out the forms on the PBX.... IF the tie span between nodes A and B is loop start, ground start, or E&M wink, no CPN information can be passed. No more than it could be if you used any of these protocols on your local trunks to telco. __________________ - calvin Last edited by oozenoz; April 27th, 2006 at 03:35 PM.