2-12
Cisco Multiservice Packet Network Solution Overview
OL-3025-01
Chapter 2 Solution Components
Call Agent
Figure 2-8 AS5400 Physical Connections—Pure Call Agent Configuration
A recommended configuration is to use multiple Cisco 7500 series routers as edge routers to aggregate
the voice traffic as they make a clear separation between traffic aggregation and the core network routers,
and provide a high level of redundancy. Any data traffic should be handled by additional Cisco routers.
The voice-based Cisco routers can route local traffic within the POP without any load on the core, handle
MPLS label imposition and disposition, and determine traffic classifications. The routers run the Hot
Standby Router Protocol (HSRP) so that the iMSS call agent detects a virtual router rather than active
and standby routers.
Call Agent
Two platforms of the Italtel Multiservice Switching System (iMSS) are available, as follows:
• iMSS-4050—a versatile call agent. This platform provides the control functions for the voice traffic
over the IP network, with the media gateways interconnecting the IP and TDM networks. This setup
is running the iMSS in a pure configuration, and the platform is deployed where the POP traffic is
predominantly transit and the pure call agent features are required.
• iMSS-4040—a versatile call agent and TDM switch. This platform also provides the control
functions for the voice traffic over the IP network, but in addition provides the TDM switching
capability, linking the TDM network to the media gateways. This setup is running the iMSS in an
enhanced configuration, and the platform is deployed where either a significant amount of TDM
traffic is switched at the local POP, or where ISDN and V5.1 and V5.2 terminations are required.
As a call agent, both the iMSS-4040 and iMSS-4050 interpret the signalling messages and route the calls
through the packet backbone. The iMSS is the Media Gateway Controller (MGC) and Signalling
Gateway (SG), controlling the voice traffic through well-defined standard protocols. The MGC uses
MGCP to control the Cisco media gateways and thus control the voice calls over the MPLS network. The
SG handles the dialogue between all the various Telecom signalling protocols based on the Signalling
System 7 (SS7) suite.
72460
V
V
PSTN
TDM
TDM
Cisco AS5400
Cisco AS5400
Fast
Ethernet
Fast Ethernet or
1 GBPS
Ethernet
Ethernet
Cisco routers
Cisco routers
EMS
VLAN
MPLS
Core
Cisco Catalyst
switches
Italtel iMSS
call agent
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