Tele2 IMS Based VCC
Standards Definition - Voice Call Continuity
VoWiFi Evolution Path
Basic call VoWiFi – No Mobility
- 3GPP defined VCC solution to enable operator to offer seamless voice service across CS domain based on UMTS/GSM cellular &IMS domain based on WiFi hotspot
- 3GPP Rel-7 TS.23.206, 24.206: VCC is defined for handover between IMS & CS
- 3GPP Rel-8 TS 23.237, 24.237: SC includes PS-CS access transfer & PS-PS access transfer.
VoWiFi Evolution Path
Basic call VoWiFi – No Mobility
- Terminal: WiFi access soft client or native client on smartphone
- Optionally security enhanced features in SBC e.g. TLS/SRTP
- One number service & anchoring for termination
- Integration with RCS
- Terminal: without VCC capability
- AS:T-ADS able to select WiFi domain (not specified in standard yet)
- Terminal: with VCC capability
- AS: VCC function between WiFi & CS/PS
- IMS support multiple registrations with the same IMPI