User guide

Chapter 17: AltiGen IP Phone Configuration
224 MAXCS ACC 6.7.1 Administration Manual
Possible scenarios
• During the IP phone’s start-up stage, if Enable DHCP is ON and Auto Discovery is
set to YES, the IP phone configures its IP address from DHCP, and at the same time,
it gets the MAXCS SERVER address from DHCP option 120. The user is then prompt-
ed to set his extension number and password.
• If Enable DHCP is OFF, then the phone’s IP address and the MAXCS SERVER ad-
dress must be set manually.
• If Enable DHCP is ON and Auto Discovery is NO, the DHCP option 120 value is
not sent to the IP phone. The MAXCS SERVER address must be set manually.
• If Enable DHCP is ON and Auto Discovery is YES and DHCP option 120 is set, the
IP phone always gets a new IP address, and DHCP option 120 refreshes the value of
MAXCS SERVER, even if MAXCS SERVER already has a value. The screen pauses for
2 seconds while the IP phone gets the MAXCS IP address from DHCP 120.
Disabling Auto-Discovery
To disable auto-discovery on individual AltiGen IP phones, each phone must have its
Menu > System > Auto Discovery menu item set to NO.
To disable auto-discovery on all phones, do not set DHCP option 120, or delete it if you
have already set it.
When auto-discovery is disabled, the MAXCS SERVER address must be set manually.
When You Have Two AltiGen Servers in the Same Network
If there are two AltiGen servers in the same network, some IP phones will get the wrong
server IP address and cause log on failure. See the warning on
“Configuring Auto-
Discovery of Server IP Address” on page 221.