Aastra Telecom 57I CT - Manual (Page 8)

Features in Release 2.1.1
4 RN-001029-00, Rev 04, Release 2.1.1
IP Phone Release Notes 2.1.1
DHCP Options 60 & 43, Server Configuration
The Aastra phones now support Option 60 and Option 43 as per RFC 2132.
Option 60 (Vendor Class Identifier) provides the DHCP server with a unique
identifier for each phone model. This enables a system administrator to send the
phone a customized Server Configuration in option 43. The table below lists the
identifier values use for each phone model.
The System administrator can use the Vendor Class Identifier to send the phone a
customized Server Configuration in option 43 (Vendor-Specific information).
Using Option 43 to Customize the Phone
A System Administrator can customize the IP Phone(s) in the network by entering
a text string in the phone’s configuration files. The following is an Option 43
example using Linux.
On the startup of the phones, when the DHCP server receives the request with the
information in this example, it allows the 57i phones to use FTP and the 57i CT
phones to use TFTP from the same server.
Model Identifier Value
51i AastraIPPhone51i
53i AastraIPPhone53i
55i AastraIPPhone55i
57i AastraIPPhone57i
57i CT AastraIPPhone57iCT
Note: If Aastra IP Phones receive the server configuration from both
DHCP Option 66 and DHCP Option 43, then Option 43 takes precedence
over Option 66.