Altigen ACM 6.7 Administrator's Manual page 393

When you create a dial plan, a default UM Mailbox Policy is created automatically and
associated with the dial plan (see Figure 165).
Figure 165. A Default UM Mailbox Policy is created when you create a new dial plan
3. After creating a dial plan, open its Properties dialog box, select the Settings tab,
and change Audio Codec to G.711 (see Figure 166).
4. Click OK.
Figure 166. Changing Audio Codec to G711
5. Add your MAXCS server as a UM Gateway: Go to Organization Configuration >
Unified Messaging > UM IP Gateways > New UM IP Gateway.
Additional Steps for Bridged Access and Native VM Integration
MAXCS ACM 6.7 Administration Manual 379