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Wireless E911 Guide CG-EWCG-001
BellSouth Wireless E9–1–1/SS7 Interconnection
Guide Issue 3, January 6, 2004
• TR 73554 Issue D, December 2002 (or later), BST GUIDELINES TO TECHNICAL
PUBLICATION GR-905-CORE (Telcordia document GR-905-CORE specifies the interfaces
required to interconnect out-of-band Common Channel Signaling (CCS) networks that utilize
the Signaling System Number 7 (SS7) protocol provided by a different CCS Network. The
BST CCS Network will have its own particular architectural variations and technological
capabilities. Therefore, the intent of the TR 73554 is to supplement GR-905.)
• NENA 05-501, NENA Technical Information Document on SS7 Guidelines for MSC to
Selective Router Connectivity, Original Issue, October 2002. The NENA 05-501 Technical
Information Document (TID) provides a reference for Wireless Service Providers (WSP) on
the basics of E9-1-1 SS7 translations to the Selective Router (SR). It was issued to address
the obvious need for guidance on SS7 translations between the MSC and the SR. It presents
a broad view of the E9-1-1 related SS7 translations that exist today (2002), and possible
ones for the future.
NOTE: This BellSouth Wireless E9-1-1/SS7 Interconnection Guide document references
configurations detailed in the NENA 05-501 SS7 Guidelines for MSC to Selective Router
Connectivity TID. The two documents should be used together to gain a more clear
understanding of the requirements surrounding using SS7/ISUP supported trunking for
wireless E9-1-1 in BellSouth’s E9-1-1 serving area.
• J-STD-036-A Enhanced Wireless 9-1-1 Phase 2. This Joint Standard has been issued
and approved by the Telecommunications Industry Association and the Alliance for
Telecommunications Industry Solutions, June 2002. This joint standard defines the messaging
required to support information transfer to identify and locate wireless emergency services
callers.
• NENA 03-006, RECOMMENDED STANDARDS FOR E9-1-1 CALL CONGESTION
MANAGEMENT. This NENA document provides additional details regarding how to
establish the proper quantity of Wireless trunks into an E9-1-1 Tandem based on generally
accepted "best practices".
• "BellSouth SR/ALI to MPC Interface Specifications for TCP/IP Implementation of
TIA/EIA/J-STD-036 E2" (Contact Intrado for the latest issue supported on BellSouth ALI
Data Base systems). This is an Intrado document that fully describes the Intrado SR/ALI E2
messaging interface. This is the interface that BellSouth is using!
Specific "Wireless E9-1-1" interconnection requirements for the CCS network interconnection architecture
and the interface protocol for call setup are defined in this BellSouth Wireless E9-1-1/SS7 Interconnection
Guide document. This document will define the interconnection requirements in the BellSouth E9-1-1
Network when using SS7/ISUP in concert with one of the various Wireless E9-1-1 options identified in J
STD-036-A, and in the NENA 05-501 and 03-006 documents.
The MOST IMPORTANT thing this document can relay is the following:
IT IS IMPERATIVE THAT ALL PARTIES UNDERSTAND WHAT IS REQUIRED TO
MAKE WIRELESS E9-1-1 WORK PROPERLY IN AN SS7/ISUP ENVIRONMENT.Any
questions or doubts that the WSPs Network/Translations Engineer may have, should be brought to
the attention of BellSouth BEFORE proceeding with any provisioning steps. The WSPs BellSouth
Account Representative will arrange to get answers to any questions from the appropriate BellSouth
Network/Translations E9-1-1 personnel.
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