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 20
Issue Date Dec 2017
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 20 provides the following updated information:
- Appendix K, IP Multimedia Subsystem (IMS) Overview, has been updated to reflect the Alliance for Telecommunications
Industry Solutions (ATIS) activities related to 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
- Appendix L, Network Interconnection to Support the Delivery of Legacy Emergency Call Originations to IP-Enabled PSAPs, has
been updated to better align with the National Emergency Number Association (NENA) i3 Version 2 standard.
- 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 clarify the role of ¿external¿ Emergency Call Routing Functions (ECRFs) versus
¿internal¿ ECRFs in routing emergency calls that traverse a Legacy Selective Router Gateway. The updates in this section also describe
the impact of the ¿Answer All Calls at a Bridge¿ i3 transfer model on call setup signaling associated with initial and transferred
emergency calls, and describe the role of the Emergency Incident Data Document (EIDD) in signaling associated with emergency calls that
are transferred between i3 Public Safety Answering Points (PSAPs) and legacy PSAPs that are served by Selective Routers.
- Appendix O, Support for Text to 9-1-1, has been updated to address the need for interworking 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 the progress made in
industry activities related to support for the delivery of heightened accuracy location information associated with wireless emergency
originations to PSAPs. Impacts on functional elements and interfaces associated with expanding the heightened accuracy location
architecture to support access to External Location Servers are also discussed. The updates to this appendix also address the
development of 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
Issue 20 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 19.
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.
Components of this product are:
Table of Contents:
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