Interfaces for Interim VoIP E9-1-1 Architecture (i2)

V0 Interface: LIS to VoIP Endpoint.
The V0 interface is used to provide a means for a VoIP endpoint to receive information corresponding to a pre-determined location.

V1 Interface: VoIP Endpoint to Call Server/Proxy.
The V1 interface is between the VoIP Endpoint and the Call Server within the VSP's network.

V2 Interface: Call Server/Proxy to VPC.
The V2 interface is used to request emergency call routing information when the Call Server/Routing Proxy/Redirect Server is a separate element from the VPC.

V3 Interface: LIS to VPC (Optional).
The V3 interface provides a means for the VPC to obtain the emergency caller's location.

V4 Interface: Call Server/Routing Proxy to ESGW.
The V4 interface is used to forward the call to the appropriate ESGW.

V5 Interface: Call Server to Redirect Server.
The V5 interface is defined as a SIP interface to a Redirect Server so it supports a subset of the SIP specification.

V6 Interface: Call Server to Routing Proxy.
The V6 interface is defined as a SIP interface to a Routing Proxy.

V7 Interface: Location Validation Interface.
The V7 interface is used by the LIS provider to request validation of a given Civic Location as compared with the MSAG-based data stored in the VDB. A location validation request includes at least the civic location. The response includes an indication of whether or not the Civic Location is a valid address recognized by the MSAG, and may include error/diagnostic information to assist in resolving problems. The interface should be able to support individual location validation requests sent one at a time for validation processing. The V7 interface is a web server that is described by a WSDL (Web Service Description Language). More information can be found at http://www.nena.org/xml_schemas/nena.htm under NENA Schemas, Release 4.1, I2, Schemas and WSDLs.

V8 Interface: VPC to ERDB.
The V8 interface supports queries from the VPC to the ERDB. The VPC sends location information for the emergency caller to the ERDB to obtain routing information (ESRN), and other information to help in selection of an appropriate ESQK for the call and to support the delivery of call/location information in response to ALI database requests. The V8 interface is a web server that is described by a WSDL (Web Service Description Language). More information can be found at http://www.nena.org/xml_schemas/nena.htm under NENA Schemas, Release 4.1, I2, Schemas and WSDLs.

V9 Interface: LIS/VPC to Root Discovery Operator.
The V9 interface allows a VEP/LIS or VPC to discover the appropriate VDB/ERDB.

Relevant NENA Documents
NENA Interim VoIP Architecture for Enhanced 9-1-1 Services (i2)