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10-9

Cisco IP Telephony Network Design Guide

78-11103-03

Chapter 10 Migrating to an IP Telephony Network

Reference Models for Migration Configurations

• MWI on/off can instruct the receiving switch to illuminate the message

waiting indicator on a phone when the user has a new message. Without this

capability on the link, MWI cannot be available on the switch remote from

the voice messaging system.

• Both-ways origination refers to the capability to initiate and answer a call on

the same trunk. This would normally be desirable for traffic purposes to avoid

the need for more trunk connections.

Note QSIG is not available in Cisco CallManager Release 3.0(5).

PRI provides the best feature set currently available.

Table 10-2 indicates which elements are normally passed across the trunk

interface. Different PBXs, however, might not use the information to implement

all available features for a given trunk type. Table 10-3 provides an approximate

guide to feature availability when using PRI.

If calls originate on one system, are passed to the other and then forwarded back,

two channels are used on the PRI and remain in use (tromboned) until the call is

torn down or released. The implication for traffic engineering in a T1 environment

is that only 11 such calls could use the entire PRI link.

Table 10-3 Feature Availability with PRI

Feature PBX-PBX IP-IP IP-PBX

Transfer Yes Yes Yes (on originator’s system)

Conference Yes Yes Yes (on originator’s system)

Calling number display Yes Yes Yes (can depend on PBX configuration)

Calling name display Yes Yes Yes

Called name display Yes Yes No

Call pickup groups Yes Yes No

Music on hold Yes No No (no music when Cisco AVVID puts the call on

hold)

Camp-on features Yes No No

Operator services Yes No No (unless a separate Cisco AVVID attendant is

configured)

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