Cisco 7912 - TEKELEC Manual page 153

Cisco 7912 Telephone User Guide
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4. Click Call Contact on the menu (circled in the previous screen) to open the
New Call dialog box.
5. Click Dialing Options to open the Dialing Options dialog box.
6. Click on the drop-down menu in the Connect using line field and scroll down
any entries until you find your telephone number (circled).
Set Up Outlook for TAPI 141