ABSTRACT: This document replaces TR-NWT-001144.

Issue 3 of GR-1144, OSSGR Section 6: Signaling, replaces Issue 2.

GR-1144 contains the trunk and line signaling generic requirements for the operator services system. Some of these signaling requirements are identical to access tandem requirements; they are referenced in Sections 2 through 4. Sections 5 through 11 describe those requirements that are unique to the operator services system. Signaling requirements for interfaces with other network elements, such as the interface between the Core System and databases, are contained in GR-1149. Issue 3 of GR-1144 reflects the following changes:

• Issue 3 describes Bearer Independent Call Control (BICC) signaling and the call scenarios in which BICC signaling is used. BICC signaling is used to establish, process, and release calls over an Asynchronous Transfer Mode (ATM) or Internet Protocol (IP) backbone network.
• Issue 3 references the BICC generic requirements in GR-3100 for call scenarios in which BICC signaling is used, rather than ISUP signaling.
• Issue 3 refers to logical traffic groups, rather than physical trunk groups, whenever BICC signaling is used.