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If the party you call cannot hear you, check two things:
1- while on phone with the party, change the configuration dial on the headset base to 1. (We have Nortel phones and it must be on 1 for headset and mic to work with Nortel phone sets.)
2- Push IN on the headset volume control. Pushing IN activates or deactivates to MUTE feature on the headset.
We're had customers call with similar issues. First, make sure your compatibility dial is set properly (located on the side of the base). If set incorrectly, it will make your headset inoperable. If that doesn't fix your issue, try disconnecting and reconnecting the battery and then perform a subscription. Both steps can be found below:
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.