I am using CME. I have VPN tunnel between Cisco CME and Linksys VPN router in the branch office. Cisco IP phone behind the Linksys needs to be register through VPN in CME. When I check network config on the IP Phone, it shows IP address for the Linksys VPN router as TFTP server, but it should have IP address of CME as TFTP server in order to be registered. Is there somebody knows how to assign TFTP IP address (CME) statically to 7970? Also is it possible CME forward TFTP IP address through VPN to IP Phone behind the Linksys VPN router?
You must define TFTP server IP address in DHCP option 150. If linksys DHCP server does not support option 150 you must use other DHCP server that will allow you to enter option 150. Or you can manually configure your phone with static IP including TFTP address.
link to configure static IP (this is for CCM 4.1 but applies to other versions as well)
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