Content for TS 23.218 Word version: 18.0.0
9.2 Interfaces defined for a SIP Application Server
9.3 Description of Application Server related subscriber data
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9.2 Interfaces defined for a SIP Application Server p. 41
9.2.1 S-CSCF - Application Server (ISC) interface p. 41
This interface can be used by the Application Server to control an IP Multimedia session via a S-CSCF. Transactions between the S-CSCF and the Application Server on this interface are initiated either as a result of the S-CSCF proxying a SIP request to the Application Server or by the Application Server initiating by generating and sending a SIP request to the S-CSCF. This interface is based on SIP.
9.2.2 Application Server - HSS (Sh) interface p. 41
The Sh interface is between the HSS and the SIP Application Servers and the OSA SCS and may be used for transferring User Profile information.
The Sh interface also supports mechanisms that allow Application Servers to activate/deactivate their own existing initial filter criteria stored in the HSS on a per subscriber basis.
9.2.3 Application Server - SLF (Dh) interface |R6| p. 41
The Dh interface is between the SLF and the SIP Application Servers, the OSA SCS, and the IM-SSF and may be used for retrieving the address of the HSS which holds the User Profile information for a given user.
9.2.4 Application Server - MRFC (Cr) interface |R8| p. 41
The Cr interface allows interaction between an Application Server and an MRFC and is described further in subclause 8.2.2.
9.2.5 Application Server - MRB interface (Rc) |R8| p. 41
The Rc interface is used by the AS to request that media resources be assigned to a call when utilizing MRB in Query mode. See clause 13.
9.2.6 Transit Function - Application Server (ISC) interface |R11| p. 42
This interface can be used by the Application Server to control an IP Multimedia session via a transit function. Transactions between the transit function and the Application Server on this interface are initiated as a result of the transit proxying a SIP request to the Application Server. This interface is based on SIP. The interface implements the Mf reference point, as defined in TS 23.228.
9.3 Description of Application Server related subscriber data p. 42
9.3.1 Application server subscription information p. 42
9.3.1.0 Introduction |R7| p. 42
This subclause defines the general contents of the Subscription Information that may be required by the Application Server. The AS shall obtain this information from the HSS via the Sh interface or by other operator defined methods. The subscription information may be retrieved during registration or at any other time dependent on AS and service requirements.
9.3.1.1 Service key p. 42
The Service Key identifies to the Application Server the service logic that shall apply.
9.3.1.2 Service platform trigger points (STP) p. 42
Service Platform Trigger Points (STP) are the points in the SIP signalling that instruct the Application Server to trigger the service logic.
9.3.1.3 Service scripts p. 42
The Application Server can utilize a call processing script (e.g. in CGI, CPL, Java® Servlets, or another proprietary language), which may be obtained from the HSS via the Sh interface or by other operator defined methods.
