Question about Cisco 7940G IP Phone

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I have a 7940 series phone that my office just got me. Brought it back in my suitcase, tried to hook it up and no power at all. Does it need replacing?

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Posted on Jan 02, 2017

Democritus
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SOURCE: 7940 cisco ip phone being powered by a power brick

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

  • 97 Answers

SOURCE: The Cisco 7940 Phone...if you

It is possible for them to monitor voip calls, if your call passes through their network, or they do remote monitoring on network traffic. The voip traffic is only data that needs to be 'reassembled' to hear the voice stream. However, this is more difficult if the traffic is encrypted between the phone and the call manager or whatever they are using.

I am no legal person, but I am sure that you would have to have agreed to have your calls monitored for them to be able to do this.

Posted on Oct 16, 2010

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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.
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For 7906G and 7911G phones:
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The Cisco 7940 Phone...if you work from home and use this phone can your Corp office be able to monitor your calls?


It is possible for them to monitor voip calls, if your call passes through their network, or they do remote monitoring on network traffic. The voip traffic is only data that needs to be 'reassembled' to hear the voice stream. However, this is more difficult if the traffic is encrypted between the phone and the call manager or whatever they are using.

I am no legal person, but I am sure that you would have to have agreed to have your calls monitored for them to be able to do this.

Oct 11, 2010 | 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...


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.

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Currently I am setting up one HP ProCurve J9148A 2910al-48G-PoE Switch to support Cisco IP Phone 7940 Series. When i am using straight cable to connect to the IP Phone, the phone can be detected and can be...


As IP Phone is somekind of a PC, then when you are connecting it to a switch you should use streight cable.
Cross cable should be used when you are connecting two PCs back-to-back.

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2 Answers

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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 ;-)

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This is happening because your "Self-Cleaning" hookswitch is going bad. Since it's a carbon contact design, this will happen more and more frequently. I recommend sending your Cisco IP phones to IdacomUSA for repair and refurbishment. If you are the DIY type of person, we are also selling the pad and assembly for the Cisco hookswitch at $15 each (w/minimum order)

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