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Chapter 10 Migrating to an IP Telephony Network

Reference Models for Migration Configurations

10-8

Cisco IP Telephony Network Design Guide

78-11103-03

Model A poses two main questions for consideration:

• Should the trunk connections remain on the PBX until the end of the

migration, or should some trunks be moved to the IP network along with

users?

• What type of connection should be used between the PBX and the IP

network?

Table 10-2 shows the feature set supported by each type of connection.

The following points briefly explain the importance of the features in Table 10-2:

• Calling number, in addition to being displayed on the called phone, can be

used for billing and voice mail purposes.

• Called number is important if the receiving switch is going to route the call

directly to a phone, rather than terminating first at an attendant. The called

number is also used for voice mail.

• Calling name is displayed on the called phone.

• Diversion reason (busy, ring-no-answer) can be used by voice mail systems

to play different greetings.

Table 10-2 Connection Types and Feature Sets Supported

Connection

Type

Calling

Number

Called

Number

Calling

Name

Diversion

Reason

MWI

On/Off

1. MWI = Message waiting indicator

Both-Ways

Origination

Relative

Cost

FXO/FXS No Yes No No No No Tiny

E&M/R2NoYesNoNoNoYesSmall

BRI/PRI Yes Yes Yes No No Yes Medium to

Large

QSIG Yes Yes Yes Yes Yes Yes Large

Digital set

emulation

Yes Yes Yes Yes No Yes Medium

PBX WAN

protocol

Yes Yes Yes Yes Yes Yes Large

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