Cisco WS-X4604-GWY - VoIP Gateway Spezifikationen PDF herunterladen (Seite 203)

CHAPTER

10-1

Cisco IP Telephony Network Design Guide

78-11103-03

Migrating to an IP Telephony Network

This chapter explains how an enterprise can migrate from a conventional PBX and

its adjunct systems, principally voice messaging, to an IP telephony network. Four

migration models are presented, encompassing various feature sets, and the steps

for achieving each are outlined.

This chapter contains the following major sections:

• Network Models, page 10-1

• PBX and Voice Messaging Interfaces and Protocols, page 10-2

• Simple IP Network Migration Sequence, page 10-3

• Reference Models for Migration Configurations, page 10-6

Network Models

Conventional voice networks to be migrated to IP networks contain, at a

minimum, a single PBX and often several PBXs, which can be geographically

dispersed. A network of PBXs can use a specialized, proprietary networking

protocol to provide features across the different PBXs.

If voice messaging is a part of the voice network, the voice messaging systems are

connected to the PBX using a protocol and hardware interface. If there are several

voice messaging systems in the network, they might be networked to appear to the

user as a single messaging system. Generally the protocols used to connect to and

network between voice messaging systems are proprietary. See Figure 10-1.

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Cisco WS-X4604-GWY - VoIP Gateway Spezifikationen Seite 203