AASTRA 480i User Manual

Advanced Operational Features

6-8

41-001129-00 Rev 09, Release 1.4.1  

IP Phone Administrator Guide

The IP phones can perform an auto-discovery of all servers on a network using 
mDNS. When the IP phone discovers a TFTP server, it is automatically 
configured by that TFTP server.

An unconfigured phone (phone right out of the box) added to a network, attempts 
to auto-discover a configuration server on the network without any end-user 
intervention. When it receives DHCP option 66 (TFTP server), it automatically 
gets configured by the TFTP server.

An already configured phone (either previously configured by auto-discovery or 
manually configured) added to a network, uses its predefined configuration to 
boot up.

1. Configuration parameters received via DHCP do not constitute 
configuration information, with the exception of a TFTP server.  
Therefore, you can plug a phone into a DHCP environment, still use the 
auto-discovery process, and still allow the use of the TFTP server 
parameter to set the configuration server.

2. DHCP option 66 (TFTP server details) overrides the mDNS phase of 
the auto-discovery. Therefore, the DHCP option takes priority and the 
remaining process of auto-discovery continues.

3. As the phone performs auto-discovery, all servers in the network 
(including the TFTP server), display in the phone window. However, only 
the server configured for TFTP automatically configures the phone.