1. Telia/Nortel Pre-SPIRITS implementation Sören Nyckelgård Telia Research AB soren.m.nyckelgard@telia.se Using SIP to bridge between old and new

2. The “SPIRITS server” Users’ SIP-enabled services “Signaling Control Gateway” “Signaling Control Gateway” SS7-IP Protocol Converter PSTN ISDN GSM INAPISUP MAP SIP IP cloud “Interconnector” E.164 database “Interconnector” E.164 database SIP redirect (Number Portability) SIP proxy (Service Router) SIP... is a Protocol Converter and a SIP Server. PBX cluster QSIG

3. Signaling Flow Example PSTN INAP: IDP SIP: INVITE (A) SIP: 301 Moved INAP: CON SIP: 404 Not Found INAP: CUE SIP: 404 Not Found Interconnector E.164 database Interconnector E.164 database Redirect : Number Portability Proxy : Service Router Signaling Control Gateway Signaling Control Gateway SS7-IP Protocol Converter Service Service based on a SIP redirect server (B) or SIP: INVITE

4. GSMISDNPSTN Characteristics No new protocolsNo new protocols No changes to existing networks except reconfigurationsNo changes to existing networks except reconfigurations No media via MG unless one of the endpoints is IP-homedNo media via MG unless one of the endpoints is IP-homed Number PortabilityNumber Portability –bunus feature or first application –globally and between networks ServicesServices –globally distributive –need only to support SIP –SCN terminals appear as SIP clients –multi-network services IP cloud service