P.2 Activation of mobility management for IMS voice termination

24.0083GPPCore network protocolsMobile radio interface Layer 3 specificationRelease 18Stage 3TS

An MS activates mobility management for IMS voice termination when:

1) the MS’s availability for voice calls in the IMS (see 3GPP TS 24.301 [120], subclause 3.1) changes from "not available" to "available";

2) the MS is enabled for mobility management for IMS voice termination;

3) the IMS voice over PS session indicator received for Iu mode has the value

– "IMS voice over PS session supported in Iu mode, but not supported in A/Gb mode", or

the IMS voice over PS session indicator received for S1 mode has the value

– "IMS voice over PS session in S1 mode supported"; and

4) at least one of the two parameters voice domain preference for UTRAN and voice domain preference for E‑UTRAN as defined in 3GPP TS 24.167 [134] is not "CS voice only".

The MS deactivates mobility management for IMS voice termination when the MS’s availability for voice calls in the IMS (see 3GPP TS 24.301 [120], subclause 3.1) changes from "available" to "not available".