DHCP for IP Phones on Svr2k8r2
To get your IP phones to work, you only need four things for your initial phone configuration:
- IP Address
- Subnet Mask
- Default Gateway (Default Router)
- TFTP Server
The first three come by default built into Windows Server 2008r2, but TFTP server (option 150) is not a built-in option. It was much easier with Server 2003, but it is actually a bit of a process with Server 2008r2. To add Option 150 (TFTP Server), you need to enter the following commands at the command prompt:
Netsh
DHCP server \\<name of your DHCP server>
add optiondef 150 TFTPserver IPADDRESS 0 comment=”Option added for TFTP server”
set optionvalue 150 IPADDRESS <ip address of TFTP server>
After you have entered these commands in with the appropriate information you will have your Option 150 IP address and your IP phones will be able to pull their configs from the mothership.