ESW – May 2010 UK Architecture for VoIP 999/112s John Medland – BT 999/112 Policy Manager

UK Emergency Service BT or CW Public Network Fixed/Mobile Networks Stage 1 PSAPs BT (5) or C&W (2) Public networks Police 52% Ambulance 42% Fire 6% Coastguard <1% 999/112/ (204 Local Controls) ( Public Emergency numbers - 999/112, (ITU v21 text over voice, ie real time text using special terminals) 31 million calls each year to stage 1 PSAPs, 55% from mobile phones Around 60% are connected to Stage 2 PSAPs (usually within 10 seconds)

Location for emergency callers Available automatically on fixed and mobile calls at Stage 1 and Stage 2 PSAPs Fixed lines : civic locations as name and address updated daily to Stage 1 PSAP database Mobile networks provide cell coverage area (enhanced with timing advance for some) over standard ETSI interface: radius ~2.2km Limitations for VoIP calls, calls from private networks, mobile roamers Stage 1 PSAPs provide Location Servers which can be accessed by Stage 2 PSAPs ( location retrieved instantly using telephone number + secure TCP/IP link) Industry funded Stage 1 PSAPs supply location free to Stage 2 PSAPs (Stage 2 PSAPs pay for their lines, hardware and software) Telematics emergency calls (non-standard eCalls) growing and can provide GPS information

Handling VoIP 999 now PSAPs still TDM based so VoIP goes through PSTN / IP Gateways Small number of VoIP 999s at present, mostly fixed users Regulation says if PSTN access, then must allow s identified as VoIP Registered “default” address accessed through E164 tel number (CLI) for “fixed” users…. ….but default address marked as needing voice confirmation  Verbal routing Device/CPE use PSTN/GSM for 999 if possible Key issues for VoIP 999 : - - only default name+address data from large number of VoIP SPs - challenge of 24 hour VSP contact point for PSAP use (tracing, alternative contact numbers) - lack of information to PSAP for nomadic users Need to Automate Location provision………

NICC Task Group The Network Interoperabilty Consultative Committee : NICC is a UK telecommunications industry committee which acts as an industry consensus group in which specifications and technical issues associated with network competition can be discussed. It also is a source of technical advice to the UK Regulator Location Task Group : Routing 999/112 for VoIP to correct local EA supplying caller location information on all calls Membership : BT, C&W, Ericssons, Huawei, Andrew, Nominet, Magrathea, Aeonvista,Vodafone, VirginMedia, Orange, and Ofcom +…. Approach :- - VSP, ISP and Access Provider(s) all different organisations - PSAPs are still TDM based - Start with UK only (all parties UK-based) - Cover DSL, Cable, Enterprise, WiFi and GSM scenarios - Use developing standards wherever possible, eg IETF, ETSI - Don’t rely on user - Don’t rely on device

Key VPC VoIP call CLI + VSP1 id VSP 1 Soft-Switch Emergency Handling Authority – Stage 1 PSAP Internet service & access infrastructure providers PIG CLI + VSP1 id IAIC Request using CLI, VSP id. Response gives location 1 c 3 4 b ISP LIS SBC2 PSTN—IP Gateway VSP 2 soft switch (Aggregation + SS7 interconnect ) a SBC1 SBC1/2 Source IP+Port, VSP 1 ID and CLI information (NENA v2) Access and IP Log-on functions 2 Voice path Data path Overview of Architecture and Interfaces HELD third party request using Source IP (+ Port no.), in HELD ID extensions. Response gives PIDF-LO LIS URI IP

VoIP Positioning Centre VSP Soft Switch Emergency Handling Agency ISP LIS IAIC (IP Address to ISP Converter) Interface (a) Key Parameters (CLI, Source Public IP Address, source port number) Interface ( b) Parameter (Source Public IP Address) Inteface(b) Parameter (ISP LIS URI) Interface ( c ) Parameter (Source Public IP Address) Interface (4) Parameter (CLI) Interface (4) Parameter (Location) Interface( c ) Parameter (PIDF-LO Location) VPC Functions

IAIC AS / LIS mapping IP / AS mapping IP Address LIS URI BGP4 Route Collector BGP Route Updates Interface (b) BGP Peers VPC - Mapping Source IP address to ISP

LIS HELD Server translation; Border Functions - NAPT/SBC/AL G OSS Systems Network elements Interface (c) iL2 iM1 iC1 iB1 LIS Other LIS Generic LIS Functions

Broadband and ADSL Access

Way Forward for UK NICC Standard published Jan New requirements on all organisations (systems development) Many more organisations involved to deliver 999 (not just traditional telcos but VSPs and ISPs) New operational components : LIS and VPC New interfaces for all organisations: based on international standards as far as possible (eg IETF HELD) Increased co-op and trust relationships between PSAP and VSP, ISP and Access networks NICC Work to continue : other use cases, IP PSAPs (IP end to end)