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What is session transfer number for SRVCC in delete subscriber data?when this will be sent to mme?

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What is session transfer number for SRVCC in delete subscriber data?when this will be sent to mme?
posted Feb 7, 2015 by Gnanendra Reddy

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1 Answer

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Its a number which MME stores the STN-SR (Session Transfer Number for SRVCC) along with C-MSISDN of the UE from the HSS during the UE attach procedure.

answer Feb 8, 2015 by Salil Agrawal
will you tell the purpose of this IE
- Per TS 24.237 the STN-SR is assigned to the SCC-AS/ATCF
- For the case where the SRVCC is enhanced with the use of the ATCF, the STN-SR is used to direct signaling towards the ATCF, otherwise it is used to direct signaling to the SCC AS per TS 23.237
- According to TS 23.003, STN-SR follows the E.164 telecommunications number format
- It is used by the MSC for session transfer of the media path from the PS domain to the CS Domain
- The STN-SR is provisioned in the HSS as part of the subscriber profile information to indicate that the UE is SRVCC capable (TS 23.216)
- If the STN-SR is updated from the value that is in the HSS, then the SCC AS updates the HSS which in turns updates the MME
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