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Chapter 10 Migrating to an IP Telephony Network

Reference Models for Migration Configurations

10-10

Cisco IP Telephony Network Design Guide

78-11103-03

If the trunks remain on the PBX, so that billing can be done at one point, it can be

difficult to identify IP-originated calls by calling number.

The following configuration steps are required for the type A system:

Step 1 Configure the PRI link.

a. Add PRI gateway in Cisco CallManager and configure.

b. Add PBX PRI card and cable to IP network, and configure PRI on PBX.

c. Add Cisco CallManager route group to steer outgoing calls to the PRI trunk.

Step 2 Migrate each user.

a. Delete phone in PBX.

b. Modify PBX trunk routes to steer user calls to the IP network.

c. Add user phones in Cisco CallManager.

Step 3 Move PSTN trunks from PBX to IP network.

a. Delete trunks and routes from the PBX database.

b. Add trunk groups on the PBX to steer outgoing calls to the IP network.

c. Configure IP gateway hardware and software.

d. Move trunk connections to IP network.

e. Configure trunk groups and routes in Cisco CallManager.

f. Configure Call Detail Recording (CDR) for the IP network.

This configuration scenario assumes that users retain the same DNs after the

migration and that trunks are moved after the users have migrated. Otherwise, it

would be possible to preconfigure the IP phones and to allow users to have two

working phones on their desks throughout the migration period. However, most

users with Direct Inward Dialing (DID) service want to keep their original DN.

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Cisco WS-X4604-GWY - VoIP Gateway Especificaciones Pagina 212