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ULR with AVP 1493 = NOT_SUPPORTED(0)

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When a ULR includes AVP 1493 Homogeneous-Support-of-IMS-Voice-Over-PS-Sessions = NOT-SUPPORTED(0), does it mean that it is a regular LTE registration or it can end with VoLTE registration?

posted May 8, 2018 by Kohava Bentov

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1 Answer

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It would be unnecessary to include Homogeneous-Support-of-IMS-Voice-Over-PS-Sessions AVP in ULR for each UE.
Attach request message from UE contains "Voice domain preference and UE's usage setting" IE, based on value of this IE and prepared TAI list, MME gives indication to HSS. It does not make sense to consider this AVP for an UE which is registered with netowrk along with CS voice preference.

answer May 10, 2018 by Vimal Kumar Mishra
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Referring to the 3GPP 29.272 the "Homogeneous Support of IMS Voice Over PS Sessions " AVP is set to TRUE in the ULR means that the serving MME can provide the IMS voice support homogeneously in all TA assigned to it.
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I am going through the spec 3gpp 29.219(Sy interface) and trying to understand the call flow and AVPS between the OCS and PCRF.

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Thanks

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