ABSTRACT: This document replaces TA-NWT-000317 and TR-NWT-000317.

Issue 10 of GR-317, Switching System Generic Requirements for Call Control Using the Integrated Services Digital Network User Part (ISDNUP), replaces Issue 9.

GR-317 describes the Telcordia view of generic requirements for the procedures required to establish and release call connections using the Signaling System Number 7 (SS7) protocol. These generic requirements focus on basic interoffice voice calls that do not originate or terminate on Integrated Services Digital Network (ISDN) lines and on call connections that are either completely within one network or between distinct networks where and Interexchange Carrier (IXC) is not involved.

Common Channel Signaling (CCS) is a method for exchanging information between Stored Program Control Switching Systems (SPCSs) that are interconnected via a network of signaling links. In switching systems where CCS is used for call connection signaling, out-of-band signaling messages replace Multifrequency (MF) and other inband interoffice signaling mechanisms on selected circuits. The out-of-band messages are used to report circuit seizure and transport address information, answer supervision, circuit release, etc.

These requirements are based on SS7, a Common Channel Signaling (CCS) protocol defined by the International Telecommunications Union-Telecommunication Sector (ITU-T), and the T1S1.3 Working Group of the Alliance for Telecommunications Industry Solutions (ATIS) T1 Committee. The Telcordia specification of the SS7 protocol is provided in GR-246.

Issue 10 includes:

• Updated Section 3.1.1.6 with new requirements for receipt of ANM before ACM with and without backward call indicators
• A new Appendix E which describes IMS and SS7 and IMS interworking.