IMPROVEMENT FOR INITIAL IMS REGISTRATION

WIPO Patent Application WO/2019/091489

A1

A method of improving initial IMS registration after 403 Forbidden response is proposed. A UE sends a SIP register to an IMS server for initiating IMS registration. The initial IMS registration fails and the UE receives a SIP message with a 403 Forbidden response code. In the 403 Forbidden response code, the IMS server includes an XML body and uses the header value of the XML body to indicate an error type (e.g., temporary or permanent) followed by a retry-after timer value. As a result, the network can indicate to UE whether the IMS registration rejection is permanent or is due to some temporary internal failure. By adding the retry-after timer value, the network can indicate to UE when to retry the next IMS registration.

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JUTILA SAMI (FI)
NAIK ROHIT (CN)
NIEMI MARKO (FI)
PENG WEI-CHIANG (CN)
HUANG-FU CHIEN-CHUN (CN)

PCT/CN2018/115233

May 16, 2019

November 13, 2018

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MEDIATEK SINGAPORE PTE LTD (SG)
JUTILA SAMI (FI)
NAIK ROHIT (CN)
NIEMI MARKO (FI)
PENG WEI CHIANG (CN)
HUANG FU CHIEN CHUN (CN)

H04L29/08

WO2012130510A1

2012-10-04

US20170094512A1

2017-03-30

BEIJING SANYOU INTELLECTUAL PROPERTY AGENCY LTD. (CN)

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