Altigen MAXCS ACC 6.5 Administration Manual page 407

Figure 9. 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 10).
4. Click OK.
Figure 10. 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.
Chapter 28: Microsoft Exchange Integration
MAXCS ACC 6.5 Administration Manual 393