[Dime] diameter redirect

["Paulo Rolo" <paulo-j-rolo at ptinovacao.pt>]

Hello,

We are currently developing a set of Diameter interfaces and some doubts have arise, concerning SLF usage.

On ETSI TS 123 228 (IP Multimedia Subsystem (IMS)) at section 5.8.1 (User identity to HSS resolution) it is suggested that a Public User Identity should be selected and used as input to SLF_QUERY, in order to resolve to the correct HSS name. 

Also at section 6.1.2 (S-CSCF registration/deregistration notification) of TS 129 228 (IP Multimedia (IM) Subsystem Cx and Dx Interfaces), it is suggested that if Routing Information is not available for SAR (S-CSCF registration/deregistration), it should be routed to next diameter node, for example SLF.  

The issue is that on TS 129 229 (Cx and Dx interfaces based on the Diameter protocol) at section 6.1.3 (Server-Assignment-Request (SAR) Command) the Public-Identity is presented as an optional attribute. If it is not present how should be SLF_QUERY performed? All the other messages (UAR, LIR, MAR) have Public-Identity as mandatory.


Thanks in advance,
Paulo Rolo

Network and Protocols Unit
Intelligent Networks Department
Portugal Telecom Inovação, S.A



 





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