Altigen ACM 6.7 Administrator's Manual page 402

Configuring for Out Calling from UM
d. In the SIP Early Media field, select Enable.
e. In the SIP Transport field, select TCP.
5. Associate this new codec profile to the IP address of Exchange Server (and only
Exchange Server):
a. Click the Servers button, then click the IP Codec tab.
b. Add a new IP Device Range for the Exchange Server:
Figure 177. Associating your "Exchange" codec profile to the IP address of Exchange Server
6. Click the Add button in the IP Device Range panel.
7. Select the codec profile you just created specifically for Exchange.
8. Enter the IP address of the Exchange Server in both the From and To fields. Be sure
that this IP address does not fall into any other device range. (Check the IP Codec
tab and the IP Dialing Table tab.) If it does, reset that range into two ranges: one
that ends just before the Exchange Server's IP address, and one that starts just after
the Exchange Server's IP address.
9. In MaxAdmin, go to PBX > Voice Mail Configuration. In the Exchange Integration
panel, select Bridged Access to Exchange 2007 or Native VM Integration with
Exchange 2007. Click OK.
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MAXCS ACM 6.7 Administration Manual