If you point your phones to the IP Office, which you should be, and leave the HTTP field blank but enter a TFTP IP address the IP Office will proxy the HTTP request as TFTP before sending it to the server (assuming you are using 4.2).
Kyle Holladay
ACA-I, ACA Call Center, ACS-I, ACS-M, TIA-CTP, MCP/MCTS Exchange 2007
ACE Implement: IP Office
"Thinking is the hardest work there is, which is the probable reason why so few engage in it." - Henry Ford