Question about Cisco 7940G IP Phone

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Convert CISCO 7940 to SIP

Hello all

please can someone help with real world stem for doing this?

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

Posted on Aug 26, 2008


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Posted on Jan 02, 2017


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Can i make calls with a Hide ID? cisco ip phone 7960 series

You will need to configure this through whatever SIP gateway you are using, it is not configured through the handset.

May 23, 2011 | Cisco 7940 IP Phone

1 Answer

Hi,i wanna use cisco ip phone 7940 as sip ip phone.when i power up the phone ,it can get ip from network,but finally,it shows "TFTP timeout"in display led.All the buttons can not be used.What...


the DHCP server should be providing the address of the TFTP Server as DHCP Option 150. The most likely problems are:

Option 150 not defined, or not the correct IP address of the TFTP Server.
Or possibly your TFTP Server is not functioning properly.

If you have not Option 150 defined, the phone will use the default gateway as the TFTP server address.

Cheers, Simmo99.

Dec 29, 2010 | Cisco 7940 IP Phone

1 Answer

Want to migrate fom sccp to sip protocol for cisco IP Phone 7912

Here's a great little document from Cisco directly, called "Converting a Cisco 7940/7960 CallManager Phone to a SIP Phone and the Reverse Process"
Easy to do, just follow the step-by-step directions.

Jan 21, 2010 | Cisco 7912G IP Phone

1 Answer

How do you hide the displayed number on Cisco Phone?

You will need to modify the template assigned to that particular phone. Depending on the service you are using (CallManager onsite or hosted VoIP, or other options), you may or may not actually have access to make these changes. See also Cisco's guide located at

Jan 08, 2010 | Cisco 7940 IP Phone

1 Answer

I am trying to unlock my phone to program it under sip

Complete these steps:
1.On the Cisco IP Phone, press the Settings button.
2.Press **#
3.When the window displays Settings Unlocked, click the More softkey.
4.You now see the Erase softkey, which can be used in order to erase the configuration on the Cisco IP Phone.
I hope that this has been very helpful for you

If this solution will not helpfull for you that time pls send me a IP Phone details.

Jan 01, 2010 | Cisco 7940 IP Phone

2 Answers

Cisco IP Phone 7940 and 3com nbx as 3rd party SIP phones

Here are the instructions for configuring these units for 3cx

Since the 3cx softphone worked well, I don't see why you couldn't configure each as for 3cx and make them work as well.

Dec 09, 2009 | 3Com NBX 2102PE IP Phone

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

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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