Configuring Single Sign-On for Cisco Unity Connection allows users to access their mailboxes using their voicemail pin on their mobile phones, eliminating the need for multiple login prompts.

D.

To enable mobile phone users to access their Cisco Unity Connection mailboxes by only entering their voicemail PIN at the login prompt when calling the pilot number, an engineer should configure the alternate extensions feature.

The alternate extensions feature allows users to associate one or more alternate extensions with their primary extension, which is usually their desk phone. This feature can be used to allow users to access their Unity Connection mailbox from a mobile phone or another phone that is not associated with their primary extension.

To configure alternate extensions for a user in Unity Connection, follow these steps:

1. Log in to the Unity Connection Administration interface.
2. Navigate to the user account that needs the alternate extension configured.
3. Click the "Alternate Extensions" tab.
4. Click the "Add New" button to add a new alternate extension.
5. Enter the phone number for the alternate extension and select the type of phone (e.g., mobile phone).
6. Click "Save" to save the new alternate extension.

Once the alternate extension is configured, the user can call the Unity Connection pilot number from their mobile phone and enter their voicemail PIN at the login prompt to access their mailbox.

Note that this feature requires that the Unity Connection pilot number is configured to accept incoming calls from the mobile phone number. The engineer should ensure that the appropriate call routing and permissions are configured to allow mobile phone users to access their mailboxes via the alternate extension.