Hi, I have a Cisco IP 7920 and I think I need to upgrade the firmware to use SIP (Asterisk). Can someone tell me where I can get the firmware and instructions to upgrade this phone? Thanks, Scott

Hi, I just purchased the Cisco 7920 IP phone. Can this phone be used for a Asterisk phone system? Also, the documentation talks about a USB port but I do not see a USB port on the phone nor did I get a USB cable. I did however get a CAT cable which ...