ABSTRACT: This document replaces TR-NWT-000246.

Issue 10 of GR-246, Telcordia Technologies Specification of Signalling System Number 7, replaces Issue 9.

GR-246 defines the procedures and protocol by which network elements in the Public Switched Telephone Network (PSTN) exchange information over a digital signaling network. This enables wireless and wireline call setup, routing, and control.

This document:

• Contains the fundamental specification of SS7, which is then used as a basis for other generic requirements documents for Common Channel Signaling (CCS) network elements
• Is based on the latest ANSI T1 Standards agreements and is critical for vendor implementations and carrier deployment
• Ensures that SS7 messages are transported without alteration and ensures interoperability, potentially saving millions
• Lists all the signaling point codes assigned to network carriers

• Message Transfer Part (MTP)
• Signaling Connection Control Part (SCCP)
• ISDN User Part (ISUP)
• Transaction Capabilities Application Part (TCAP)
• Operation, Maintenance, and Administration Part (OMAP)

• Addition of a new section specifying interworking between the Session Initiation Protocol (SIP) and the ISUP protocol
• Updated signaling point code assignment guidelines to assign point codes for CCS network use by carrier
• Updated signaling point code assignment list.