On phone 1, dial the access code necessary to get an external line.
Dial an external phone number. If you do not reach the external number, continue with step 4.
If you reach the number, Cisco Unity can access external lines for message notification. Message notification settings in the subscriber template may be preventing Cisco Unity from making notification calls. Verify the message types and access code in the template, and change the values if necessary. If you make changes to the template message types or access code, you must make the same changes to all existing subscriber accounts based on the subscriber template.
Review the phone system programming for restrictions on external line access. Change the phone system programming values as necessary, and repeat the test.