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Cisco Unity integrates with Cisco Unified CME as SCCP-controlled IP phone endpoints. Each voice mail port on Cisco Unity is configured as an ephone on Cisco Unified CME, and the voice mail pilot number is configured as an ephone-dn that appears on each of the phones (ports).

The Cisco Unity ports register with the Cisco Unified CME router using a voice mail device ID (vm-device-id) such as Cisco UM-VI2. The following example shows the Cisco Unified CME configuration for connecting to a four-port Cisco Unity voice mail system.

telephony-service

voicemail 6800

!

ephone-dn 32

number 6800

name “VM Port 1”

preference 0

no huntstop

ephone-dn 33

number 6800

name “VM port 2”

preference 1

no huntstop

!

ephone-dn 34

number 6800

name “VM port 3”

preference 2

no huntstop

!

ephone-dn 35

number 6800

preference 3

name “VM Port 4”

ephone 5

vm-device-id CiscoUM-VI1

button 1:32

!

ephone 6

vm-device-id CiscoUM-VI2

button 1:33

!

ephone 7

vm-device-id CiscoUM-VI3

button 1:34

!

ephone 8

vm-device-id CiscoUM-VI4

button 1:35

The voicemail 6800 command defines the voice mail pilot number as extension 6800. You can define an ephone-dn for each of the four ports; these definitions control call routing to Cisco Unity. All the ephone-dns have 6800 as the extension and are tagged with preference 0 to preference 3. You need four individual ephone-dns, one per port, to route and deliver four calls to the Cisco Unity system simultaneously. From the Cisco Unified CME system point of view, four IP phones have an appearance of extension 6800; therefore, four individual calls to 6800 can be busy at the same time.

The preference and no huntstop designations ensure that the Cisco Unified CME system hunts across the available phones if some of them are busy.

Each of the physical ports is defined as an ephone. To Cisco Unified CME, Cisco Unity ports look like an IP phone, and they register as such. The vm-device-id (for example, Cisco UM-VI2) defined for each ephone must match the device ID configured in the Cisco Unity configuration.

You configure call forwarding to voice mail on your employee’s IP phones exactly as you would for Cisco Unity Express, as shown in the following example.

ephone-dn 1

number 6001

call-forward busy 6800

call-forward noan 6800 timeout 10

With the configurations given in the previous examples, users on your system can press the messages button on their IP phones to retrieve their voice mail. They can also call the voice mail pilot number 6800 directly—for example, from the PSTN—to access their voice mail.