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Cisco IP Telephony Network Design Guide

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Chapter 10 Migrating to an IP Telephony Network

Simple IP Network Migration Sequence

Figure 10-4 Migration Completed

Usually the transition from a conventional voice network to an IP network is made

in stages, as follows:

Step 1 Pilot stage—the IP network is introduced, and a very limited number of users are

given IP service. In this initial deployment, which often will include the telecom

or IT group, users sometimes retain their conventional phones side-by-side with

IP phones. Usually, however, they move immediately onto the new system. When

the pilot trial is stable and satisfactory for a number of weeks, it can be expanded.

Step 2 User block migration—a block of users is moved (usually over a weekend) from

the conventional voice network to the IP network. The block can be chosen as a

geographical group, a group sharing a block of directory numbers (DNs), or a

community of interest, such as the purchasing department.

Step 3 Further user block migration—the number of users moved in a block is

determined by the maximum number of users the telecom staff can move over a

weekend, and the number of weekends the telecom department is prepared to

work. In general, migration should be completed as quickly as possible.

Of course, there are many other considerations when planning a migration, such

as whether users will keep their DNs or be assigned new ones, user training,

billing systems, special features, fallback plans, and more.

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Cisco WS-X4604-GWY - VoIP Gateway Especificaciones Pagina 207