Altigen ACM 6.7 Administrator's Manual page 346

The Multi-site VoIP Domain
4. Click Create domain and join as master.
5. Enter the IP address of this system. If this system has multiple IP addresses, enter
the one that can communicate with other member servers.
6. Click OK and wait for 5 to 60 seconds, depending on the size and configuration of
the system. The display in the Enterprise Location Manager window changes to show
the name of the VoIP domain and this server as Master.
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MAXCS ACM 6.7 Administration Manual