Equipment for People who are Late-Deafened or Deaf with Excellent Speech Skills:

How CapTel works
As the CapTel user dials the phone number of the person they wish to call, the CapTel phone automatically routes their call through the CapTel call center and connects them to their called party. At the call center, a specially trained operator (a captionist) uses a customized voice-recognition computer and re-voices whatever is said by the called party. The technology transcribes the operator’s voice into captions that appear on the CapTel screen. The user may also hear the other party’s voice to the best of their ability. The CapTel operator does not hear and does not caption what the CapTel user says.

Standard phone users who call a CapTel user may dial 711 and ask for the CapTel Gate, or dial 1-877-243-2823 (toll free) to the Captioning Service, and then provide the area code and phone number of the CapTel user they wish to call. 

The process works like this:

To call a CapTel user, dial: 1-877-243-2823

Or dial: 711 and ask for the CapTel Gate

CapTel Customer Service: 1-888-269-7477