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At startup, a VSIP unit searches for a valid IP network configuration. The network
configuration for VSIP units consists of:
An IP address
A subnet mask
A gateway
The unit first searches its local memory. If no configuration is found, it tries to contact
a DHCP server. If DHCP configuration fails, either because the unit cannot find a
server or because it cannot obtain a configuration within one minute from the server
it does find, the unit assigns itself temporary network settings based on the APIPA
service.
A unit in APIPA mode does not reside on the same subnet as any of the other devices
on the network. As a result, it nay not be able to “see” other devices or be visible to
them. Units use the following temporary APIPA configuration:
IP address: 169.254. *. *
Subnet mask: 255.255.0.0
Gateway: 169.254. *. *
The *. * portion is based on the MAC address of the unit.
A unit is in APIPA mode:
The first time it boots up
After receiving a duplicate IP address
After a factory reset
When the DHCP server does not have any available IP addresses
DHCP configuration is disabled:
After a firmware upgrade
After a factory reset
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