How The Scm Works - Cisco ASR 5000 series Product Overview

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Table of Contents

Session Control Manager Overview

How the SCM Works

This section provides information on the function of the SCM in a CDMA2000 PDSN or UMTS GGSN network and

presents call procedure flows for different stages of session setup.

Admission and Routing

Admission and routing of subscriber URIs is performed through a number of configurable lists in the SCM.

The following sections describe the main admission and routing techniques used in the SCM. The following figure

presents the method and order for admitting and routing sessions within the SCM.

Figure 153. Admission and Routing Method

Registration request

CSCF Access Control Lists

Access Control Lists (ACLs) are a set of rules that are applied during CSCF session establishment. A typical use of

these rules is to accept or deny registration or session establishment requests. ACLs may be tied to subscribers and/or

the whole service. Subscriber based ACLs can also be imported from an external ACL/policy server. In that event, the

external policy server address would be configured with the service.

A complete explanation of the ACL configuration method is located in Access Control Lists Appendix of the Session

Control Manager Configuration Guide.

Translation Lists

Translation lists help modify request-uri (i.e. addressing of a CSCF session). One example is that E.164 numbers could

be altered by adding prefixes and suffixes or the request-uri could be modified based on the registration database.

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