Uniphone 1140 TTY/ VCO/HCO
It is perfect for making Voice Carry Over (VCO) or Hearing Carry Over (HCO) calls. With VCO, you speak directly to the other person and read their typed responses on the display. VCO calls can be made through a toll-free relay service, or directly between Uniphone users for absolute privacy. In a similar way, people who can hear but cannot speak can make Hearing Carry Over (HCO) calls.