The T20 is a complete, dual-line telephone with an ergonomically designed, convertible headset. Includes all the features of the T10 single-line headset telephone, plus a handy call hold button and three-way conference calling.
Highlights

* Dual-line telephone with ergonomically designed, convertible headset
* Includes convertible headset for over-the-head stability or over-the-ear convenience
* Noise-canceling microphone reduces background noise
* Adjustable volume and tone control
* Redial, flash and mute buttons