Question about Centurion ITT/Cortelco 3691 Basic Desk Corded Telephone with Hold, Data Port and Message Waiting (3691COLORVOE27F)

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Buzz with plantronics headset

On my Cortleco phone I have a CS55 plantronics and I have a buzzing sound

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  • Cef H Oct 23, 2008

    Plantronics DSP-400 has developed a buzz on recordings, made somewhat better (but not good enough to use the recordings they produce) by running the PC to which they are attached on battery power vs. power cable. Happens on two different laptops (XP and Vista) and in different locations. Playback through speakers is unaffected. Moving the cable and mic around during recording seems to have no effect. I'm guessing some internal shielding has failed, and this is the end of their life. My students are so sad they'll now have to *read* the scripts that go with the lectures I've been recording for them. Turns out college students don't much like reading. Go figure.

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Plantronics CS55 Headset


Office was wired that way i have one tried several ways to use it without the lifter did't work had to buy a lifter the next problem is the phone not all will work Cisco uniden will work good

Jun 18, 2014 | Plantronics CS55 Wireless Headset

1 Answer

I was given a CS55 Plantronics head set. Looking for directions to set it up


If you click on the following page:

Plantronics CS55 Wireless Headset

Towards the bottom of the page, click on the tab labeled ADDITIONAL INFORMATION. Within that section, you will see PLANTRONICS CS50/CS55 INTERACTIVE USERS GUIDE to click on. This will help you visually see how to setup and start using your CS55.

Good Luck from Headsets Direct!

Jun 15, 2011 | Plantronics CS55 Wireless Headset

1 Answer

I cannot here the phone ringing from my CS55 headset or another call coming in.


You will need the Plantronics HL10 handset lifter in order to have the CS55 ring, indicating an incoming call. The HL10 also allows you to answer remotely on most phones and hang-up remotely.

Plantronics HL10 Handset Lifter

Good Luck from Headsets Direct!

May 17, 2011 | Plantronics PL-CS55 Wireless Headset

1 Answer

Incoming call alert


You will need the Plantronics HL10 handset lifter in order to have the CS55 ring, indicating an incoming call. The HL10 also allows you to answer remotely on most phones and hang-up remotely.

Plantronics HL10 Handset Lifter

Good Luck from Headsets Direct!

May 17, 2011 | Plantronics CS55 Wireless Headset

1 Answer

We have numerouse CS55 headsets that keep cutting out when speaking on the phone. Choppy sound, missing parts of words etc. Intermittent, will be good for 5 -10 minutes, then bad again.


The first thing to try is resetting the CS55. We hear this a lot and once reset, it usually takes care of the problem. It's equal to a ctrl+alt+del on a computer. Click on the following for detailed instructions and photos:

How to Reset your Plantronics CS55 Wireless Headset

Good Luck from Headsets Direct!

Apr 13, 2011 | Plantronics CS55 Wireless Headset

2 Answers

All of a sudden my CS 55 with plantronics stopped working. It shows that its on but the headpiece isnt charing and also doesnt work. Any ideas why?


If the Plantronics CS55 wireless headset shows that it is on, you have to make sure of the following things.

a. the green LED on the base turns on when you turn the call switch on from the headset.
b. the small green LED on the side of the headset is blinking.
c. the telephone headset is lifted from the cradle.
d. if the headset is not charging and the Amber light on the base does not blink when you place wireless headset on it; trying placing the headset more firmly.
e. If the headset is not charging and the Amber light on the base does not blink even after placing the wireless headset firmly on the charging cradle, you may need to change the battery.

Alternately you can try resetting the Plantronics CS55 wireless headset.

Reset Plantronics CS50, CS60 or CS55 Wireless Headset

If you have problems with the sound or connection of your Plantronics CS50, CS60 or CS55 wireless phone headset, you may want to try to hard reset it using the following steps:

Note: Ensure the IntelliStand switch (on the right side of the charging base) is in the - position and NOT the = position.

1. Press both the call control button and the listening volume/mute button for 5 seconds. When the indicator light blinks release both buttons.

2. Press the call control button again. The talk indicator light will again blink to indicate the headset is back to normal.

3. Disconnect the AC charger from the AC charging jack for 5 seconds.

4. Reconnect the AC charger.

Now give the Plantronics headset a try.

Jan 10, 2009 | Plantronics CS55/HL10 Wireless Office...

2 Answers

Best Buy: Plantronics Problem


James, plug the phone cord that comes out of the back of the CS55 base into the handset port of the Cisco phone, not the headset port.  Then plug the coily cord from the cisco receiver into the front of the CS55.  Don't use the "Headset" button on your Cisco phone, just lift the receiver off.

Mar 21, 2008 | Plantronics PL-CS55 Wireless Headset

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