Question about Cisco 7940 IP Phone

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Testing a Cisco 7940G phone

We have a 7940G phone to fix and we don't have the Cisco equipment to test it on.  Is there a way that we can test it on another computer source (such as our own ethernet) or a single line port?  We are just trying to repair and test the phone.  Any help would be greatly appreciated.




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What is the issue you are trying to fix? I do not have any Cisco products other than IP phones and I have been able to fix many "broken" phones.

Posted on Jul 09, 2008

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Heidi the only way you can test this telephone will be on a network that has cisco callmanager software installed.

Posted on Oct 19, 2007


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I have upgraded my 3550 to a 3560v2 48portPOE and can not get my cisco 7940G to power up. The switchport is green but when I look at the power inline log it does not see the phone or that it is a POE...

Are you sure it is a PoE model? The 3650v2 comes in both a PoE and non PoE model.

PoE models: 3560V2-24PS, 3560V2-48PS
non-PoE models: 3560V2-24TS, 3560V2-48TS

Apr 15, 2011 | Cisco 7940 IP Phone

1 Answer

7940G IP Phone: how to solve the protocol application invalid prob...


This happens when you IP phone communicated with the Voice vlan with the IP address of data vlan.

To solve it manually enter the IP address of the TFTP server and option 150 on the DHCP server.
remove the voice vlan from the switch port and reboot the phone
again add the voice vlan and reload the phones

May 17, 2010 | Cisco 7940G IP Phone

2 Answers

7945g can't use power supply of 7940

You'll need to buy a another power supply unless you have power over Ethernet. The power supply for 7940G/7960G is CP-PWR-CUBE and for 7941G/7945G you'll need a CP-PWR-CUBE-3. Yes, I know, I just got one of those and it's a pain to configure it, but I got it working... ;-)

P.S. If you haven't notice, you will be dealing with a whole different thing, the configuration/settings will ALL (except for the dialplan file) different from the 7940G... Good Luck ;-)

Aug 02, 2009 | Cisco 7945G IP Phone

1 Answer

Phone showing new messages but there aren't

Try unplugging the phone from the power or POEthernet cable and waiting a minute and then plugging it back in.

Jul 14, 2009 | Cisco 7940G IP Phone

1 Answer

V.35 Cable Local Loop

If your trying to establish a loopback for the Data Terminal Equipment, you seem to have satisfied the RTS/CTS, DTR/DSR loopback. At the V.35 end of your cable, you need to loopback the SD (balanced pairs) to the RD (balanced pairs), as well as insure that you have a valid clock source. Usually the DCE provides clock on a balanced pair SCT, SCR. towards the DTE. But, when you build a loopback cable or adapter, you can obtain clock from the DTE via the SCTE pair and tie it to the SCT and SCR balanced pairs. A lot of the requirements depend upon the DTE and DCE equipment your testing. Hope this helps...

Dec 09, 2008 | Cisco router cable, DB-60 male to V.35...

1 Answer

Converting to SIP

connect a crosscable between your cisco 7940 and the laptop
start a dhcpserver and a tftpserver on your laptop
The files i mentioned (SIP license) have to be purchased at Cisco.
start the IPPhone, thats all

Aug 26, 2008 | Cisco 7940G IP Phone

1 Answer

Convert CISCO 7940 to SIP

you need different files to upload by tftp
by example version 8
OS79XX.TXT (tells the version)

Aug 25, 2008 | Cisco 7940G IP Phone

1 Answer

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

Sep 11, 2007 | Cisco 7940G IP Phone

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