Question about Cisco 7940 IP Phone
Hello! I have searched far and wide and cannot find a solution to my phone issue! Firstly, I brought the phone off ebay with the intention to use it with Sipgate (I understand I need SIP firmware to do that). When the phone arrived I plugged it in and connected it to my router hoping (probably quite naively!) that it would just work...this obviously wasn't the case. When the phone booted up the following showed: Configuing VLAN Configuing IP (for around .5 seconds) Protocol Application Invalid (O/A in the corner) It is now stuck on Protocol Invalid... I have done the hold # 123 etc. factory reset but am unsure a/ which firmware it had originally b/ which firmware it now has being reset I have installed tftp32d as a tftp server and have tried multiple firmware upgrades (SIP versions 2.0 through to 7.1 in hope the phone would pick at least 1 up!) and nothing happens, still the same scenario! I am really at a loss at what to do, no forums or Cisco documentation has helped...I am a relative novice! Please help me!
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Posted on Jan 02, 2017
SOURCE: Cisco 7960G IP Phone Problem
Try to manually reset the phone - **#"Settings" (this will unlock the configuration) + Network + menu under number "33" - erase the configuration. Then the phone configuration will be erased. Also you can manually set IP address and TFTP server
Posted on Jun 10, 2008
Unlocking a Cisco 7940
1) Unplug the phone
2) Plug the phone back in while holding the # key
The phone will soon display “Reset key sequence detected”
3) After several lights flash press the following keys in order:
1 2 3 4 5 6 7 8 9 * 0 #
4) The phone will then ask you if you want to save the network configurations:
Save network cfg? 1=yes 2=no
5) The phone will soon display “Factory reset initiated” and will continue
through the boot up process.
If that process fails to work for some reason there
is a second method.
Complete these steps:
Also see this link
Posted on Nov 25, 2008
SOURCE: Cisco 7911G definitely dead?
You are very close to fixing your problem. You will need the correct firmware and files; these are proprietary but you should be able to acquire them from your certified reseller. Alternatively, here at IdacomUSA, we have the proper firmware on hand, and can flash the phone for you to get it back to life. Call us at 1-800-903-9190 or visit us at http://idacomusa.com
Posted on Feb 11, 2010
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