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VoLTE Diameter registration response (ULA)

+1 vote
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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:
1. The HSS will accept the VoLTE registration - what in the ULA will indicate on the VoLTE registration approval?
2. The HSS won't accept the VoLTE registration - will the ULA will include failure? How the ULA will look like?

posted May 8, 2018 by Kohava Bentov

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+2 votes

I know the fact P-CSCF establishes an IP sec tunnel with the UE but exact at which point it does not sure.

+3 votes

Hi Experts,
We are facing an issue where UE sends multiple IMS-registration requests, below is the scenario
UE is successfully registered to IMS. However UE re-sends an IMS registration request with same nonce value and receives 200 OK. Why UE re-sends IMS registration while it is already registered.

Thanks in advance.

+1 vote

As specified in the TR 23.749 (Study on S8HR architecture for VoLTE), for calls to a non detectable emergency call, the P-CSCF may return the SIP response 380 "Alternative service".
Referring on the RFC3261 (SIP), the SIP response 380 should include the alternatives services in the message body.
Based on this content, the UE may either retry the call in CS domain (CSFB) or retry a VoLTE call to an alternatives local P-CSCF (unauthorized emergency call in VPLMN).

However, in the last RFC3261 I have (December 7th 2015) the message body format within the response 380 is not defined and is subject to future standardization.

May someone have more information about the format of the message bodies with the SIP result 380?

+1 vote

Redirection (3xx), Client failure (4xx), Server failure (5xx) and Global failure (6xx) in which scenarios these codes are used ?

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