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SMS over IMS?

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SMS over IMS?
posted Jun 4, 2019 by Sumith Singh

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+3 votes
"Homogeneous Support of IMS Voice Over PS Sessions" in S6a ULR

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.
Does the MME insert this AVP in the ULR message only if the UE required voice service over IMS during the attach procedure.
In other word, if this AVP is present in the ULR, can we conclude that the UE support Voice call over IMS (VOLTE).

In the same context, if this AVP is absent ("Homogeneous Support of IMS Voice Over PS Sessions ")m can we conclude that either the MME does not support VOLTE at all or the UE does not support it (but only CSFB?

0 votes
Local breakout is configured and VPLMN flag is enabled in HSS, still some subscribers using Home PGW for IMS APN.

Some In-Roamers are seen using visited PLMN’s MME, SGW but they are still using home PGW even though static selection of SGW & PGW are configured in MME for all roaming MCC+MNC. That mean any visitor will Locally break out and use specific SGW & PGW for IMS and Internet APN. But few subscribers seen using their home PLMN PGW for IMS APN. What are the scenarios that can trigger the visitor to use their home PGW. Once purged from MME then subscriber start using visited network’s SGW and PGW, which is an expected behaviour. Also these few random subscribers have switched off and switched on their device and also hover between VoWiFi / Volte during their stay multiple times still the PGW used is their home PGW.
Please help to understand and decode this scenario.

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