Summary

Recommendation ITU-T Y.2255 specifies the voice and video call continuity (VCC) over long term evolution (LTE), Wi-Fi and 2G/3G. The scenarios and relevant requirements are specified, as well as the solutions for access transfer between each of the access types, handover policy, terminating access domain selection (T‑ADS), evolved packet data gateway (ePDG) selection and other call continuity related solutions.