You are designing a Cisco Unity voice-mail-only solution to allow all outside callers at any of the
14 different company offices to locate any of the 7500 users by simply spelling the name of the
user via the touch-tone telephone keypad in an Automated Attendant conversation. Each office
has a different voice-mail system that you will replace with the new Cisco Unity solution. Each
office also has a separate telephone system. The telephone systems come from various
manufacturers. Users dial individual 10-digit phone numbers to reach each user. There is no
telephone networking between offices. Many of the telephone systems will not allow conferencing
and have a limited number of trunks for each office. The customer is not willing to change the
telephone system structure at this time.
Which solution best meets the customer needs?

A.
This can be done with VPIM, which is an industry standard that allows different telephone
systems to integrate over the Internet.

B.
You can network the Cisco Unity systems together for subscriber-to-subscriber messaging, but
to fulfill the requirements they want for Automated Attendant transfers between offices, they need
to change to a networked telephone system solution.

C.
Create a new forest/domain and add one Cisco Unity server at each office. All Cisco Unity
systems are member servers in the forest/domain and are provisioned for the number of users at
that site. On one Cisco Unity server a dialing domain is created and all other Cisco Unity servers
join that dialing domain. The directory handler search scope is set to that dialing domain.

D.
This can be done with the optional Cisco Unity PBX conference feature that allows transfers
between different PBXs by using the Intel Dialogic voice cards installed in all Cisco Unity servers.