Cisco Voice Interworking Services (VISM) Manual de usuario descargar pdf (Pagina 8)

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Cisco Multiservice Packet Network Solution Overview

OL-3025-01

Chapter 2 Solution Components

Media Gateways

The redundancy in the topology is achieved using dual virtual LANs and multiple components—MGXs

with VISMs, Catalyst switches, and Cisco routers—with multiple connections to the MPLS network. A

recommended configuration is to use multiple Cisco 7500 series routers as edge routers to aggregate the

voice traffic because 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 point of presence (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.

Each VLAN is connected to one side of the OPM of the iMSS call agent.

Figure 2-5 MGX with VISM Physical Connections—Enhanced Call Agent Conﬁguration

PVCs are setup between the MGX and the edge router, and all packets are sent across these PVCs

regardless of their destination. For reliability, VISM supports two independent STM-1 interfaces each

with its own PVC—one is designated the primary and one the secondary. Loopback cells are sent every

200 ms on each PVC as the heartbeat mechanism.

Cisco AS5400 and AS5400HPX Gateways

The Cisco AS5400 or AS5400HPX media gateway together with the Italtel iMSS call agent can be used

to provide universal port services. This universal port functionality allows the media gateway to operate

simultaneously as a network access server (NAS) and a voice gateway to deliver universal dial

services—analog modem, digital modem, fax, and Voice over IP (VoIP)—on any port at any time.

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VLAN

Fast Ethernet

MPLS

core

PRI/E1

PBXRDT

V5.2/E1

STM-1

Ethernet

STM-1

OC-3/ATM

TDM

Network

ADM

EMS

Cisco routers

Cisco MGX with VISM

Cisco Catalyst

switches

Italtel iMSS

call agent

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