Headset turns on, but lifter has a delayed reaction
1) Make sure the green light on the CS55 base turns on/off immediately as it should when pressing the silver talk button.
2) If so, and none of the resets change anything, it may be a bad power cord or source. Try connecting the DCA to another outlet. Even if they’re using a surge protector, try another outlet on the power strip or wall outlet.
3) If there is another working CS55 (or 510S, CS50, CS70, CS351 - they all use the same DCA) in the Customer’s office, see if you can borrow the DCA from it to swap out for the one in question. A bad DCA cord can not only cause an Online Indicator not to work, but also may cause a handset lifter to delay or lift/lower like it has a mind of its own.
If the delay continues even with another DCA, its the headset system must be replaced.