S-CSCFServing Call Session Control Function
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After disconnection of UE from AN, the S-CSCF sends a NOTIFY message to P-CSCF_Old that forwards it to UE to inform it about deactivation of its registration.
After that I-CSCF transmits the REGISTER request to S-CSCF that exchanges message authentication request (MAR) and answers (MAA) with HSS and then replies with the 401 unauthorized message.
The CSCF server performs the role of a P-CSCF and S-CSCF. It forwards both request and response messages from UEs to the SIP-AS.
* Simulates P-CSCF, I-CSCF, S-CSCF, PCRF, HSS, BGCF, MGCF elements in LTE IMS network supporting Cx/Dx, Rx, Gx, Gm, Mw, SGi, Mi, and Mj interfaces
The session controlling signals are transmitted to S-CSCF through I-SCSF of the home network by means of P-CSCF of the target network.
* SIP registration messages are transmitted to S-CSCF through P-CSCF.
* Interrogating-CSCF (I-CSCF): Checks the user database (HSS) to find the appropriate S-CSCF for each user.
S-CSCF is assigned to the user during registration.
Summary of Signaling Protocols in IMS Protocol Reference Point SIP Gm, Mw, ISC, Ma, Mm, Mg, Mi, Mj, Mk, Mr Dismeter Cx, Dx, Sh, Dh, Gx, Rx, Ro, Rf MAP (Mobile Si Application Part) H.248 Mp, Mn HTTP Ut Not specified Ml, Mx, Ix, Iq Protocol Involved entities SIP UE, P-CSCF, I-CSCF, S-CSCF, AS, IBCF, MGCF, BGCF, MRFC Dismeter I-CSCF, S-CSCF, HSS, SLF, AS, SIP AS, OSA SCS, OSA SCF, IM-SSF, PCRF, MRCF, OCS, BCF, MGCF, IBCF, CDF MAP (Mobile IM-SSF, HSS Application Part) H.248 MRFC, MGCF, IMS-MGW HTTP UE, AS Not specified E-CSCF, LRF, BGCF, IBCF, TrGW, P-CSCF Table 2.
Here are the main functions of I-CSCF [4]: a) the S-SCSF assignation for users which are performing SIP registration procedures, b) interrogates the HSS node during UE initiated session setup to get the address of the S-CSCF and forwards the SIP request/respond messages to it.
The S-CSCF acts as a SIP registrar that maintains binding information (e.g., the IP address of the terminal) [23].