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Chapter 10 Migrating to an IP Telephony Network

Reference Models for Migration Configurations

10-14

Cisco IP Telephony Network Design Guide

78-11103-03

It is not possible for the voice messaging system to select the proper greeting

(“busy”, “no answer,” or “all calls”) for IP users because that information is not

sent across the PRI to the PBX.

It is also not possible for MWI information to traverse the PRI from the PBX to

the IP network. The message indication feature would, therefore, not be available

to IP users in a type B system.

The following configuration steps for the type B system include the workaround

just described:

Step 1 Configure PRI link—same as for type A system.

Step 2 Migrate each user—same as for type A system.

Step 3 Configure the phantom DN on the PBX.

a. Add the phone to the PBX and forward to voice mail.

b. Configure speed-dial key on IP phone.

c. Modify the IP trunk routes to send forwarded calls to PBX.

Step 4 Move PSTN trunks from PBX to IP network—same as for type A system.

The following list summarizes the cost of the type B system:

Hardware Software

• PRI gateway for IP network

• PRI card on PBX

• Nothing extra on

Cisco CallManager

• PRI software on PBX

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Cisco WS-X4604-GWY - VoIP Gateway Spezifikationen Seite 216