For Cisco Unity Connection 8.x, perform these steps to Bulk Edit Send Message Setting to Dial By Extension for a no: of Users.
- In Cisco Unity Connection Administration, expand Tools, and then click Bulk Edit Utility.
- In the Bulk Edit utility, select the user accounts that you want to edit.
- Click Next.
- Click the Message Send tab.
- For the Address Messages to Other Users By, you can select the option extension from the drop down menu.
- Click Next, and then click Finish.
Also refer Setting Up Features and Functionality That Are Controlled by User Account Settings.