Hi Rachel,

The Voicemail Pilot # is a unique DN configured for the integration between CCM and Unity. In most (if not all) cases there is only one Voicemail Pilot number per system unless you have multiple VM System integrations. Don't forget that this is the number that is reached when pressing the Messages Button from the IP Phone.

If you are trying to keep a "legacy" DN involved so users who dial that number still reach Unity, then I would set this number up as a CTI-RP with a permanent Call Forward to the VM Pilot#.

To Add a Voice Mail Pilot Number for the Voice Mail Ports

The voice mail pilot number is the extension that you dial to listen to your voice messages. Your Cisco IP phone automatically dials the voice mail pilot number when you press the Messages button.

Step 1 In the Cisco Unified CallManager Administration, click Feature > Voice Mail > Voice Mail Pilot.

Step 2 On the Find and List Voice Mail Pilots page, click Add a New Voice Mail Pilot.

Step 3 On the Voice Mail Pilot Configuration page, enter the following voice mail pilot number settings.

Voice Mail Pilot Number

Enter the voice mail pilot number that subscribers will dial to listen to their voice messages. This number must be the same as the hunt pilot number that you entered when adding voice mail ports earlier.

Description

Enter Cisco Unity Pilot or another description.

Calling Search Space

Click the calling search space that includes partitions containing the subscriber phones and the partition you set up for the voice mail pilot number.

Make This the Default Voice Mail Pilot for the System

Check this check box.

When this check box is checked, this voice mail pilot number replaces the current default pilot number.

Step 4 Click Insert.

From this good doc;

http://www.cisco.com/en/US/docs/voice_ip_comm/unity/401/integration/guide/ccm41u40.html#wp1772593

Hope this helps!

Rob