Cisco Cisco Packet Data Interworking Function (PDIF) Documentation Roadmaps
Session Control Manager Overview
How the SCM Works ▀
Cisco ASR 5000 Series Product Overview ▄
OL-22937-01
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.
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.
presents the method and order for admitting and routing sessions within the SCM.
Figure 170. Admission and Routing Method
Sub@cscf.2.com
Sub@2.com
Registration request
Sub@1.com
ACL1
Permit
Deny
Permit
Deny
Permit
Deny
2.com
nexthop
cscf.2.com
*@1.com
*@2.com
Translation
Match
No match
Route
Rejected
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.
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.
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.
be altered by adding prefixes and suffixes or the request-uri could be modified based on the registration database.