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Cisco IP Telephony Network Design Guide

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Chapter 10 Migrating to an IP Telephony Network

Cisco Digital PBX Adapter (DPA)

Understanding How the DPA 7630 Works

The Cisco DPA 7630 enables you to integrate your existing Octel voice mail and

Lucent PBX systems with Cisco CallManager. The DPA 7630 functions by

emulating digital phones or a PBX system. This capability allows it to appear like

these devices to Cisco CallManager, Octel, and Lucent systems.

Why is the DPA 7630 Needed?

If you want to migrate your telephony system from a Lucent Definity G3 PBX to

Cisco CallManager, you must decide whether to do a complete cutover to

Cisco CallManager or to migrate slowly. If you do a complete cutover to

Cisco CallManager and Cisco uOne (Cisco’s voice mail solution), you do not

need the DPA 7630. However, if you are slowly migrating your systems, you

might want to maintain some phones on the Lucent PBX while installing new

phones on the Cisco CallManager system. You might want to use your existing

Octel voice mail system with your Cisco CallManager system. In these cases, the

DPA 7630 can assist your migration to Cisco CallManager.

Can I Just Use SMDI?

One difficulty with migration is that voice mail systems such as Octel were

designed to integrate to only one PBX at a time. To resolve this difficulty, many

people use Simplified Message Desk Interface (SMDI), which was designed to

enable integrated voice mail services to multiple clients.

However, to use SMDI, the voice mail system must meet several qualifications:

• It must have sufficient database capacity to support two PBX systems

simultaneously and to associate each mailbox with the correct PBX in order

to send MWI information on the correct link.

• It must be possible to physically connect the IP network to the voice

messaging system while maintaining the existing physical link to the PBX.

• It must support analog integration. SMDI is primarily an analog technology.

Additionally, SMDI requires reconfiguration of your existing telephony network.

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Cisco WS-X4604-GWY - VoIP Gateway Especificaciones Pagina 223