Polycom SOUNDPOINT SIP 2.2.0 - Manual (Page 211)

Configuration Files
A - 99
Flash Parameter Configuration
Any field in the bootROM setup menu and the application SIP Configuration
menu can be set through a configuration file.
A DHCP server can be configured to point the phones to a boot server that has
the required configuration files. The new settings will be downloaded by the
phones and used to configure them. This removes the need for manual
interaction with phones to configure basic settings. This is especially useful for
initial installation of multiple phones.
These device settings are detected when the application starts. If the new
settings would normally cause a reboot if they were changed in the application
Network Configuration menu, then they will cause a reboot when the
application starts.
The global device.set parameter must be enabled when the initial
installation is done, and then it should be disabled. This prevents subsequent
reboots by individual phones triggering a reset of parameters on the phone
that may have been tweaked since the initial installation.
Caution The parameters for this feature should be put in separate configuration files to
simplify maintenance. Do not add them to existing configuration files (such as
sip.cfg). One new configuration file will be required for parameters that should
apply to all phones, and individual configuration files will be required for
phone-specific parameters such as SIP registration information.
Caution This feature is very powerful and should be used with caution. For example, an
incorrect setting could set the IP Address of multiple phones to the same value.
Note that some parameters may be ignored, for example if DHCP is enabled it will
still override the value set with device.net.ipAddress.
Individual parameters are checked to see whether they are in range, however, the
interaction between parameters is not checked. If a parameter is out of range, an
error message will appear in the log file and parameter will not be used.
Incorrect configuration could cause phones to get into a reboot loop. For example,
server A has a configuration file that specifies that server B should be used, which
has a configuration file that specifies that server A should be used.
Polycom recommends that you test the new configuration files on two phones
before initializing all phones. This should detect any errors including IP address
conflicts.