Section: 4.3.5.8A Homogenous Support of IMS Voice over PS Sessions Indication
Content: The "Homogenous Support of IMS Voice over PS Sessions" indication is provided by the MME to the HSS, and can be used by the HSS to avoid requesting the serving nodes whether or not an IMS Voice over PS session according to TS 22.173[ IP Multimedia Core Network Subsystem (IMS) Multimedia Telephony Service and supplementary services; Stage 1 ]  [73] with a bearer that supports Conversational Voice as specified in TS 23.203[ Policy and charging control architecture ]  [6] is supported. This indication is stored in the MME MM context. The MME shall behave as follows whenever it sends a Update Location Request or a Notify Request message to the HSS: - if "IMS Voice over PS Sessions" is supported homogeneously in all TAs in the serving MME for the UE, the MME shall include the "Homogenous Support of IMS Voice over PS Sessions" indication set to "Supported". - if none of the TAs of the serving MME supports "IMS Voice over PS Sessions" for the UE, the MME shall include the "Homogenous Support of IMS Voice over PS Sessions" indication set to "Not supported". - if "IMS Voice over PS Sessions" support is either non-homogeneous or unknown, the MME shall not include the "Homogenous Support of IMS Voice over PS Sessions" indication. Regarding homogenous support/non-support of IMS Voice over PS session for all registered TAs of the UE, see clause 4.3.5.8.