Cisco Voice Interworking Services (VISM) Instrukcja Użytkownika Pobierz pdf (Strona 16)

2-16

Cisco Multiservice Packet Network Solution Overview

OL-3025-01

Chapter 2 Solution Components

Call Agent

The iMSS-4040 and iMSS-4050 use SS7 signalling protocols to handle the dialogue between the various

Telecom components, and uses MGCP to control the Cisco media gateways and thus the voice calls over

the IP network. For releases 2.0 and 2.1 of the Cisco Multiservice Packet Network Solution, it is

necessary to backhaul the SS7 signal from remote POPs to the central main POP using the existing SS7

signalling network. The iMSS call agent provides full services for the SS7 network.

The iMSS-4040 supports access to ISDN using Digital Subscriber Signalling System Number 1 (DSS1)

according to ITU-T S 300 347-1 for V5.2.

Configurations

It is possible to have a single-site (centralized) or a multisite (distributed) iMSS call agent depending on

whether the central office (CO) is located in one site or geographically distributed in several locations

(POPs) linked together. The interconnection network, carrying signalling links and bearer channels

among the POPs, can be either a pre-existing or a new circuit-based or packet-based installation.

See Figure 2-10 for an example of the iMSS-4050 call agent in a centralized configuration with the OPM

and CPS in one location (the main POP). SS7 is being carried over the existing SS7 signalling network.

Figure 2-10 Single iMSS-4050 Call Agent—Centralized Conﬁguration

See Figure 2-11 for an example of the iMSS-4050 call agent in a distributed configuration. This

configuration has additional OPMs and CPSs in the remote locations (remote POPs), distributing the SG

and MGC functions to the remote POPs. iMCP is used for intraexchange communication between the

OPMs and between the OPMs and OMS.

72750

Main POP

CPS

OPM

OMS

TDM

network

TDM

network

IMT

Remote POP X Remote POP Y

IMT

MGCP

VoIP VoIP

MGCP

Cisco

Media

Gateways

Cisco

Media

Gateways

SS7 SS7

MPLS backbone

I.N.

Signalling

Bearer

VoIP

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