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LTE: S6a PUR right after ULA

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When we send ULA to MME, right after it MME sends PUR to us for the same subscriber and the UE does not attach to network (obviously). MME is not under our control (roaming partner) so we cannot get the logs from it.

We have tried to imitate ULA as per another working UE in same roaming partner network (this connects to live HSS, not ours) and it did not work.

Can anyone please guide what could be wrong?

posted Jan 11 by anonymous

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When the UE and the MME both support VoLTE and the MME sends ULR with AVP 1493 Homogeneous-Support-of-IMS-Voice-Over-PS-Sessions = SUPPORTED(1), there are 2 options for the HHS to respond:
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2. The HSS won't accept the VoLTE registration - will the ULA will include failure? How the ULA will look like?

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