Question about Cisco 7940 IP Phone

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7940 cisco ip phone being powered by a power brick seems to loose power when connected to the ethernet. When ethernet is disconnected, power comes back. Ethernet works fine when phone is not connected. No ethernet pass through the phone either.

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Change out your cable from the wall drop to the phone. A Cisco phone is capable of receiving inline power (Power Over Ethernet) via the blue and brown pairs of the cable. It sounds like you may have a cable with a short in either the brown or blue, or both pairs, shorting out the power when it is connected via ethernet.

If you can, have your IT Tech check the cable, and the line through the wall to the switch.

Posted on May 26, 2010

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Posted on Jan 02, 2017

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How can I clear / reset a Cisco IP Phone 7910


How to set a Cisco IP phone to factory default Reset configuration of Cisco IP Phone (7910, 1911, 7940, 7941, 7960, 7961)

To set the Cisco IP phone to factory default completes the following steps: should be completed:

For 7940, 7941, 7960, 7961 phones:

1. Power up the phone (unplug power cable and plug in again and hold the # key.
2. Release # when lights start flashing.
3. Press 123456789*0#.
4. Press 1 to keep network configuration or 2 to lose the network configuration.

For 7906G and 7911G phones:
1. Power up the phone (unplug power cable and plug in again and hold the # key.
2. Release # when MWI starts flashing.
3. Press 3491672850*#.

Oct 28, 2010 | Cisco 7910 IP Phone

2 Answers

Can I use a CISCO IP 7941 phone, that has been on a company network, in my home? Should it just work by plugging in a telephone connection and using the appropriate power supply? Is there programming that...


Yes, there is programming which would need to be removed. However, you would need a cisco call manager($800) at home. Unless of course you have voip in your home. then you could just set it to DHCP I'm assuming and then it should just work!

Jan 14, 2010 | Cisco 7940 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

2 Answers

Cisco IP phone 7941-- No power on the phone just a blank screen after I installed a headset, I did unplug the headset but is not coming back on.I also tried a new Ethernet cable but no luck. What can I do...


Is the phone connected to a POW (Power Over Ethernet)Cisco Switch? Check the model number of the switch with the Cisco web site www.cisco.com

Have you check whether there is power available on the switch?
enter "show power inline" at the command prompt.

Does the phone work without the head set?
Does the same thing happen when you plug in the head set on another phone?

Jun 18, 2009 | Cisco 7940 IP Phone

1 Answer

Pc gone out of network after installing cisco


Chances are that your Cisco IP phone itself is the culprit. The ethernet jack for PC Connectivity isn't secured properly. If your phone gets dropped, or even if it was just pulled the wrong way the jack will disconnect from the traces. It's a fairly simple repair, but generally not something that everyone would want to do. If you call IdacomUSA they can repair the jack for you and make sure that you'll always be able to connect a PC in-line with your Cisco IP Phone.

IdacomUSA

1-800-903-9190

Jun 15, 2009 | Cisco 7940 IP Phone

2 Answers

My Cisco ip Phone 7940 will not ring.


Give me your number, and i'll call you! Solved! =-D

Jan 27, 2009 | Cisco 7940 IP Phone

1 Answer

7906G Home VOIP installation Problem


Then you need power adapter for Cisco 7960 IP phone ( -40V DC).
Cisco phones work best with Cisco, and sometimes ONLY Cisco switches.

One question which voice gateway you will use for your 7960 VoIP phone calls to go through ?
(AT&T probably supports only their IP Phones with special and usually hidden settings from end user)

Jan 17, 2009 | Cisco 7906G IP Phone

3 Answers

Inline power problem: cisco ip phone 7941G


You need to ensure that each port that has a phone plugged into it is configured with power over ethernet configured switched on.

Mar 20, 2008 | Cisco 7940 IP Phone

1 Answer

My client has Cisco 7940 IP phones and wants assistance with feature programming


This phone can be access through a menu/ setting buttons.

Useful link on how to navigate through the phone:
http://www.cisco.com/warp/public/779/largeent/avvid/products/7940/7940_topic3.htm
I think the main problem is to determine the intergrated router or Call manager configuration
You can also connect on switch and type:show cpd neighbor This will show the physical port connections

Nov 27, 2007 | Cisco 7940 IP Phone

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