Media for Cisco IP phone 7960 problems

Cisco IP phone 7960 problems

Help!

Have a Cisco SIP IP phone model 7960 with firmware version 7.5.

When i boot the phone i get an error "Protocol Application Invalid"

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I would like to fix this. I don't have access to a switch at the moment. Is there any way to fix this by reverting back to an earlier version of firmware? Cannot configure the phone at all. I know there are other files that need to be on the tftp server besides the firmware. What are they and does Cisco provide sample files with config info. I looked on the Cisco site but did not find much.

I want to use this phone to make ip phone to ip phone calls without a gatekeeper configured. Is it possible?

Regards,

Wayne

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