2-10
Cisco Multiservice Packet Network Solution Overview
OL-3025-01
Chapter 2 Solution Components
Media Gateways
CAR is based on a client/server model. The media gateway (client) requests name and password
information from the server; the server authenticates this information and determines which dynamic
resources the user is authorized for, returning either an acceptance containing the necessary
configuration information, a rejection to deny access, or a request for further information.
Any one or all of the authentication, authorization, or accounting functions can be subcontracted to
another RADIUS server. In some cases, the CAR could then act as a proxy server. For example, the CAR
could proxy to a Lightweight Directory Access Protocol (LDAP) server for access to directory
information about users for authentication.
Based on a Sun Solaris, CAR helps deploy access services by centralizing AAA information while
simplifying provisioning and management. However, it is important to correctly size the number of
CARs required based on the expected load, and to distribute these around the network for redundancy.
See Table 2-9 for a list of CAR components.
Protocol Support
Control Traffic
Special gateway controller protocols are used between the call agent and the AS5400 or AS5400HPX.
These protocols are transmitted as UDP/IP datagrams to the edge router on the same PVC as the voice
traffic.
MGCP provides the call control for the setup and teardown of calls. The AS5400 and AS5400HPX
support MGCP Version 1.0.
SGCP and SRCP are used by the call agent to verify that the AS5400 and AS5400HPX are operational,
and for auditing the status of the lines. Both the AS5400 and AS5400HPX support SGCP Version 1.1
and SRCP Version 1.0. Figure 2-6 shows the control traffic protocols in a sample configuration with all
components in the same location.
Figure 2-6 Control Traffic
Table 2-9 CAR Components
Product Description Quantity
AR 1.7R2 for Solaris 7/8 release Cisco Access Registrar v1.7r2, January 29, 2002 1
Cisco router
Cisco Catalyst
switch
Italtel iMSS
call agent
MGCP
UDP
IP
Ethernet
72459
MGCP
UDP
IP
Ethernet
MGCP
UDP
IP
Ethernet
Cisco AS5400
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