西門子通訊3gppip多媒體子系統(tǒng)標準化介紹-全文預覽
【正文】 H248 SIP H248 COPS SIP Diameter MAP SIP Mj … … ISUP SGW Mr CSCF Mw BGCF Mk Operator 2 SIP Dx SIP Sh MGW SGW SIP SIP CAP OSA Si IMSSF OSASCS Diameter CAP CSCF PDF HSS HLR PS Domain GGSN SGSN Gn Alternative Access Networks TCP/IP/UDP/RTP/… UE UTRAN MT TE Uu Iu R GERAN 9 WG21 , 2023/4/2 IMS ? CSCF (Call Session Control Function) ? HSS (Home Subscriber Server) ? PDF (Policy Decision Function) ? SLF (Subscription Locator Function) ? MRF (Multimedia Resource Function) ? BGCF (Breakout Gateway Control Function) ? MGCF (Media Gateway Control Function) ? MGW (Media Gateway) ? SGW (Signalling Gateway) ? AS (Application Server) ? IMSSF (IP Multimedia Service Switching Function) ? OSASCS (Service Capability Server) Additionally: QoS Entities Charging Entities Security Entities Presence Service Entities Location Service Entities Push Service Entities OAM and NM Entities Firewalls, NAT, IPv4/v6, … DNS, DHCP, … 10 WG21 , 2023/4/2 PCSCF (Proxy CSCF) First contact point of an operator?s work (within IMS CN subsystem) ? Forwarding of SIP messages between UE and CN ? Generation of charging records ? Translation of IDs other than SIP URIs into SIP URIs (. numbers) ? Authorisation of bearer resources and QoS management 11 WG21 , 2023/4/2 ICSCF (Interrogating CSCF) First contact point of an operator‘s work (for other operators) ? Forwarding of SIP messages (proxy functionality) ? Assignment of a SCSCF ? Generation of charging records ? Hiding of internal work configuration/capacity/topology 12 WG21 , 2023/4/2 SCSCF (Serving CSCF) Performs session control and service triggering ? Acts as a registrar ? May behave as a Proxy Server, . it accepts requests and services or forwards them on. ? May behave as a User Agent, . it may terminate and independently generate SIP transactions. ? Interaction with service platform(s) ? Generation of charging records ? Authentication 13 WG21 , 2023/4/2 HSS Database for subscriber related information ? User Profile ? User Identification, Numbering and addressing information (SIP, Mail, , Labels, IMSI, ...) ? User authentication support ? Call control support ? Access authentication support ? Service authorization support ? Service provisioning support 14 WG21 , 2023/4/2 BGCF (Breakout Gateway Control Function) ? Selects the work in which PSTN breakout is to occur – Forwards the session to a MGCF (selected by the BGCF) in the same work – Forwards the session to an other BGCF (or MGCF) in a foreign work ? Receives req
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