ABSTRACT: GR-1270 replaces TR-NWT-001270, Issue 1, May 1992, and Revision 1, December 1997, but contains NO TECHNICAL CHANGES from that original
document. It has been issued strictly to conform with the new Telcordia Technologies document format and GR process, and carries a new
issue number and date.
GR-1270 contains the Telcordia view of generic requirements for call-by-call selection of the listed services provided to Class II
Equipment served by an ISDN Primary Rate Interface (PRI). It completely replaces TR-NWT-001270 and its revision and bulletins.
Call-by-call service selection is a method of providing services to Class II Equipment on an ISDN PRI. Call-by-call service
selection is an alternative to providing services on a dedicated interface, a dedicated B channel, or a dedicated group of B channels
basis. Any B channel on the PRI can be used to offer provisioned services on a per-call basis.
Requirements of call-by-call selection need to be defined for each service. This document only describes the generic requirements of
call-by-call service selection for a limited number of services. Future documents will provide the generic requirements for offering
additional services on a call-by-call basis.
This document contains generic requirements for the following call-by-call services.
Foreign Exchange Selection
Tie Trunk Selection
TR-NWT-001270 replaced TA-NWT-001270. Components of this product are: