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12 1/221 02-FGB 101 327 Uen A - December 2006

towards the service layer. The S-CSCF decides whether an application

server shall be invoked based on information received from the HSS.

The S-CSCF provides the following capabilities:

• Subscriber registration by accepting REGISTER requests and

interworking with the HSS.

• User authentication through interworking with the HSS.

• Caching of user profiles. Relevant information is downloaded from

the user profile in the HSS to the S-CSCF and stored during the

registration lifetime.

• Invocation of multimedia sessions, both originating and

terminating.

• Forwarding, redirection, and rejection of multimedia sessions.

• Modification and clearing of multimedia sessions.

• Invocation of Application Servers using SIP to the CS-AS and

SIMPLE to the Presence Server, in order to trigger multimedia

services.

• Number normalization of dialed digits.

• ENUM resolution of E.164 numbers.

• Breakout gateway selection for forwarding of SIP requests to

external networks.

• Resolving the address of the I-CSCF serving the destination

subscriber through database look-up, and forwarding the SIP

request or response to that I-CSCF.

• Accounting data output using Diameter to the MM for charging

purposes.

• Create and delete private headers.

5.1.2 PSTN Gateway

The PSTN Gateway consists of the Media Gateway Controller (MGC)

including the Signaling Gateway (for SS7/ISUP connectivity) and the Media

Gateway (MGW).

5.1.2.1 Media Gateway Controller (MGC)

The Media Gateway Controller (MGC) provides interworking between the

SIP session control signaling and ISUP call control signaling to/from

external PSTN/PLMN networks. Furthermore, it controls the Media

Gateway resources using the H.248 protocol and generates Radius

information for charging and interconnect charging.

The MGC provides the following capabilities:

• Handles multimedia session establishment, modification, and

termination using the SIP protocol in the IP Multimedia domain

and appropriate ISUP protocol in the circuit switched domain.

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Ericsson W25 Bedienungsanleitung Seite 12