I have been trying for 2 days to get my SPA phones to accept the http server in option 66. I cannot get it to work and I can't find any good documentation on it. I followed what 3cx has posted on this but I am missing something. The phones are 303s on version 7.5.5. The string will not populate the rule. Can anyone point me in the right direction or give me some tips on what to do? Thanks in advance.