I have a weird situation. We have an IP Phone at a remote site that has not DHCP server on site and the firewall used at the remote site doesn't support any DHCP capabilities.
Is there a way I can manually configure the IP info (IP Address, Mask, Gateway) and TFTP server IP on Cisco IP Phone than using DHCP and option 150?
You can manually configure the IP address, mask, gateway and TFTP on the phones.
Power the phone up, go to settings > network config
Than unlock the config using by pressing the following keys
Than scroll down till you see 'DHCP Enabled' set it to No. Look for 'Alternate TFTP' and set that to Yes.
Once you do that, you will be able to configure an IP, Mask, Gateway and TFTP on the phone manually.