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Network Settings
4-6 41-001343-02 REV04 – 05.2014
Option 43 consists of the following sub-options:
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 IP Phone
A System Administrator can customize the IP Phone(s) in the network by entering a text string in the phone’s configura-
tion 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 6757i phones to use FTP and the 6757i CT phones to use TFTP from the same server.
6739i AastraIPPhone6739i
6753i AastraIPPhone53i
6755i AastraIPPhone55i
6757i AastraIPPhone57i
6757i CT AastraIPPhone57iCT
6863i AastraIPPhone63i
6865i AastraIPPhone65i
6867i AastraIPPhone67i
Sub-Option/Code Description
02 Configuration server (protocol, server, and path).
03 Redirection and Configuration Server (RCS) enable/disable.
08 ID string to enable the use of the VLAN identity in sub-option/code 09. Must be specified to avoid conflict with
other vendors.
09 VLAN ID value.
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.
Model Identifier Value