Session Control Manager Overview
▀ Network Deployments and Interfaces
▄ Cisco ASR 5000 Series Product Overview
The reference point between the P-CSCF and the User Equipment (UE).
The Gm interface provides SIP signaling between the GGSN and the P-CSCF.
The reference point between the E-CSCF and Location Retrieval Function (LRF).
The MI interface is used for routing an emergency call to a Public Safety Answering Point (PSAP). The E-CSCF
interacts with the Location Retrieval Function (LRF) to identify the next hop PSAP.
The reference point between the P/S-CSCF and other CSCFs.
The Mw interface provides SIP signaling between two CSCFs.
DIAMETER Interfaces
The following table provides descriptions of DIAMETER interfaces supported by the SCM in a GSM/UMTS network
deployment.
Table 83. DIAMETER Interfaces in a GSM/UMTS Network
The reference point between the S/I-CSCF and the Home Subscriber Server (HSS).
The Cx interface is used to authenticate subscribers, provides server assignments, push user profile information from
the HSS to the S-CSCF, and, when necessary, transmit a network initiated de-registration.
The reference point between the S/I-CSCF and Subscriber Location Function (SLF).
The Dx interface is used to proxy queries to a subscriber data server (such as an HSS) in which subscription data for a
user can be found. The SLF receives a query for the subscriber data server, looks up the address of appropriate
subscriber data server, and proxies the query to the appropriate subscriber data server.
The reference point between the P-CSCF and the Offline Charging System (OFCS).
The Rf interface is used to transfer charging information that will not affect, in real-time, the service being rendered.
For more information, refer to the 3GPP2 specification X.S0013-007-A v1.0.
The reference point between the P-CSCF/A-BG and the Charging Rule Function (CRF)/Policy Decision Point (PDP)
(PCRF).
The Rx interface (3GPP 29.211) is used to exchange Flow Based Charging (FBC) control information between the
PCRF and the P-CSCF/A-BG. The CRF uses the information to make FBC decisions that are then exchanged with the
Traffic Plane Function (TPF).
This interface is used in a 3GPP2 Release 7 implementation.
The reference point between the S-CSCF and Home Subscriber Server (HSS).
The Sh interface is used for retrieval and update of call feature data parameters.
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