Altigen ACM 6.7 Administrator's Manual page 400

Configuring for Out Calling from UM
can be different from the number that is obtained by Unified Messaging for the
outgoing call. However, your PBX can also be configured to omit the area code for
local calls and can be configured for private voice numbering plans. Any wildcard (x)
characters in the dial string are substituted with the digits from the original number
that were matched by the number mask on the dialing rule. An example valid dialed
number is 9xxxxxxx. This field can contain only numbers and the character "x".
Comment - Use this text box to input a comment or description for the dialing rule
that you are adding.
Figure 174. Creating a dialing rule
For example, if the business number of a personal contact is 5102529712, then the
number mask should be set as "91510xxxxxxx", because UM will add "91"
automatically, and the Dialed Number is "9xxxxxxx", so that the final dialed number
will be "92529712".
You can use the wild card "*" to handle any length of digits.
4. Assign the Dial Entry to mailbox Policies: Go to UM Mailbox Policies, select the
mailbox that users belong to, open the Dialing Restrictions tab, and assign the rule
group you just created.
Figure 175. Assigning dial plan to mailbox policy
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MAXCS ACM 6.7 Administration Manual