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Subscriber location function

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The Subscriber Location Function, or SLF is database contains the information about HSS that associated with particular user profile. If home domain contains more than one HSS, I-CSCF and S-CSCF will communicate with SLF and find the appropriate HSS based on user profile. CSCF communicate with SLF using diameter Dx interface and Application server communicate with SLF using Dh interface.

Specifications

3GPP Specs

They can be downloaded from http://www.3gpp.org/specs/numbering.htm . The list below is a small selection.

  • TS 23.228 IMS stage 2
  • TS 24.228 Signalling flows for the IMS call control based on SIP and SDP; Stage 3
  • TS 29.228 IMS Cx and Dx interfaces : signalling flows and message contents
  • TS 29.229 IMS Cx and Dx interfaces based on the Diameter protocol; Protocol details

See also

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