Question about Cisco 7912G IP Phone

3 Answers

LEDS are lit- one red, one green. no display, no boot

We have several IP phones that are stuck at boot.
De red and green led continue to lit
Nothing in the display
Nothing happens at all.


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  • inigoml Sep 03, 2008

    Same problem.
    However there is DHCP activity. That is, phone is trying to obtain IP address although it does not respond to DHCPoffer from server

  • Anonymous Apr 05, 2009

    i have the same problem, i setup the tftp server put the pfone does not ask for the file.. and i dont have all the files neaded for the upload, where can i found the files?


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This happing when trying to download a firmware upgrade or config from server and there is a power outgage.
Put a file called cp7912r.zup in your tftpserver root. This file can be a valid cisco image, for example, CP7912080001SIP060412A.sbin

Posted on Sep 03, 2008

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I have had the same issue with several handsets returned to me. There was DHCP activity, but the handsets never requested a file - most sites have suggested you must specify option 150 in the DHCP settings and not 66 but I eventually tried 66 and hey presto - the phone requested the 'cp7912r.zup' file.

Posted on Apr 01, 2009

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So after encountering this exact problem on nearly 10 separate phones I inevitably found this thread. While alot of the information definitely helped me to find the solution, there is a few things that were missing.
HyperTerminal or Procomm will allow you to see the boot procedure/sequence. I was continually getting stuck at the DHCP response. You will also need TFTPD32, and have it set up per these instructions :
Norksman's Factory reset code is one of the reset codes, the other one that took some digging to find was this one:
With all the proper files in place, TFTPD32 setup properly, Procomm to watch it's status, and this reset code, you should be up and running!
If not, you are more than welcome to send your phone to and I would be glad to help ya out!

Posted on Feb 18, 2009

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Failed to get boot parameters via DHCP

You didn't provide any information about your network which is ALWAYS required to provide any type of help, not to mention a solution.

"Failed to get boot parameters via DHCP, xxx seconds until reboot" simply means that the computer isn't getting an IP address from your router. Setting up your router is another entirely separate topic.

This is pretty simple though, one of three things is happening:

1. Your router is not properly configured to provide DHCP to the phone.
2. Your network cable is bad.
3. Your phone is bad (most likely the RJ45 port since the phone seems to work otherwise).

You can check for bad ports or cables by checking the port status within the router. If the port is lit up, most likely the cable and phone port are fine. This is not 100% though, replacing the cable should always be a consideration even with a lit port.

Apr 10, 2009 | Polycom SoundPoint IP 501 IP Phone

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When I power up my phone all the extension lights display (12) and the top right and 3rd from the top light up. Nothing more happens.

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Mar 01, 2009 | Mitel 5212 IP Phone

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Converting Cisco 7940 IP Phone to SIP

Unlocking a Cisco 7940

Method 1:
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.

Method 2

Complete these steps:
  1. Press Settings.
  2. The Network Configuration lock symbol must be unlocked. If not, exit to the main window and press ** # again.
  3. Press 3 on the keypad (or scroll down) for Network Configuration.
  4. Press 33 on the keypad (or scroll down) to Erase Configuration.
  5. Press the Yes softkey.
  6. Press the Save softkey.
The phone will now be reset.

Also see this link

May 18, 2008 | Cisco 7910 IP Phone

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