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Common Channel Signaling Network Interface Specification (CCSNIS) Supporting Network Interconnection, Message Transfer Part (MTP), and Integrated Services Digital Network User Part (ISDNUP)

Document Number GR-905
Issue Number 21
Issue Date Dec 2018
Replaces TR-TSV-000905 Issue02

    As Common Channel Signaling (CCS) networks have continued to evolve, and network interconnection architectures and the services they support have grown more complex, it has become necessary to identify the type of behavior all network providers are expected to exhibit when specific requirements do not exist. GR-905 provides Interconnecting CCS Networks (ICNs) and other interconnecting networks (e.g., Session Initiation Protocol [SIP]-based networks; Bearer Independent Call Control [BICC]-based networks) with the Telcordia view of critical compatibility information required for successful network interconnection with client company CCS networks. These ICNs include Interexchange Carriers (IXCs), International Carriers (INCs), and Other LATA Carriers (OLCs) such as Independent Local Exchange Carriers (ILECs) and Wireless Service Providers (WSPs).

    GR-905 includes the interface architecture and interface protocol messages, signals, conditions, and events that occur to support the exchange of information between CCS networks and other interconnected networks. In addition, GR-905 describes the physical interconnection; performance objectives; and provisioning, operations, maintenance, and network compatibility testing necessary to allow CCS networks to interconnect successfully.

    GR-905 also provides important information for providers of Legacy Network Gateway and Legacy Selective Router Gateway systems to support the delivery of emergency calls between legacy origination networks and IP-enabled PSAPs, as well as emergency calls routed via Emergency Services IP Networks (ESInets) and legacy PSAPs that are served by Selective Routers.

    Issue 21 provides the following updated information:

    • Appendix K, IP Multimedia Subsystem (IMS) Overview, has been updated to include call flows related to the Alliance for Telecommunications Industry Solutions (ATIS) activities addressing the interconnection of IMS-based Next Generation Emergency Services Networks with other legacy and Next Generation (i3 and IMS-based) Emergency Services Networks to support the delivery of initial and transferred emergency calls. Recent developments associated with the standards that describe the interconnection of IMS originating networks with legacy and i3 Next Generation Emergency Services Networks are also reflected in the updates to this appendix.
    • Appendix L, Network Interconnection to Support the Delivery of Legacy Emergency Call Originations to IP-Enabled PSAPs, has been updated to align with terminology used in the draft National Emergency Number Association (NENA) i3 Version 3 standard and to add a reference to the NENA Next Generation PSAP requirements.
    • Appendix N, SS7-Based Interconnection Between Emergency Services IP Networks and Legacy Selective Routers to Support Emergency Call Delivery and Transfer, has been updated to align the terminology and procedures with the current work going on in NENA related to the development of the NENA i3 Version 3 standard and the Legacy Selective Router Gateway standard.
    • Appendix O, Support for Text to 9-1-1, has been updated to provide further clarification regarding the interworking of the Message Session Relay Protocol (MSRP) and TTY in support of the delivery of Short Message Service (SMS)/Multimedia Messaging Service (MMS) Text to 9-1-1 messages to legacy PSAPs that are served by legacy and i3 Emergency Services Networks.
    • Appendix P, Improved Location Accuracy for Wireless Emergency Calling, has been updated to describe progress made in industry activities related to support for the delivery of heightened accuracy location information associated with wireless emergency originations to PSAPs. A summary of the CTIA report to the FCC regarding Stage Z testing is also included in the updated material in this appendix. Further clarification regarding the impacts on interfaces associated with expanding the heightened accuracy location architecture to support access to External Location Servers is also provided. The updates to this appendix also reflect the publication of an ATIS specification that provides guidelines for suppliers of location servers/services in Commercial Mobile Service Provider (CMSP) networks related to determining which Access Points should be included in queries to the National Emergency Address Database (NEAD), and which of multiple locations obtained by the Location Server via multiple technologies should be passed forward to the PSAP to support the dispatch of emergency personnel.

    Issue 21 of GR-905, Common Channel Signaling Network Interface Specification (CCSNIS) Supporting Network Interconnection, Message Transfer Part (MTP), and Integrated Services Digital Network User Part (ISDNUP), replaces Issue 20.

    The following documents were fully or partially replaced by GR-905: TR-TSV-000905, TR-TSV-000962, TA-TAP-001004, and TA-OPT-001257.

    Parts of GR-905 were moved previously to GR-954, GR-1248, and GR-1432.

    When using GR-905, you may want to refer to GR-82, GR-246, GR-317, GR-394, GR-436, GR-510, GR-693, GR-1432, GR-2878, GR-2936, GR-3029, and various standards and industry forum documentation.

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