Voice Carry-Over (VCO)
Dial 7-1-1 or 1-800-735-4423
Voice Carry Over (VCO) allows hard-of-hearing users to speak directly to a hearing person. When the hearing person speaks to them, the Relay Operator will serve as the "ears" and type everything voiced by the hearing person so the VCO user can read it on a TTY or text display.
For more information:
How Voice Carry-Over Works
VCO to TTY
Dial 7-1-1 or 1-800-735-4423
The Relay Operator will only type what you say to the TTY user you are calling. Whatever the TTY user types will go directly to your TTY or text display equipment for you to read. "GA" is needed for this type of call.
For more information:
How VCO to TTY Works
VCO to VCO
Dial 7-1-1 or 1-800-735-4423
The Relay Operator will serve as both parties' "ears" and type not only what you say to your party but also what is said to you. "GA" is needed for this type of call.
For more information:
How VCO to VCO Works
2-Line VCO
Dial 7-1-1 or 1-800-735-4423
Two-line VCO allows a customer with two telephone lines to use one line for speaking directly to a hearing person while the other line is used to receive the hearing person's typed responses at the same time. This feature provides a more natural flow of conversation without the pauses of single-line calls.
For more information:
How 2-Line VCO Works
Voice
Voice Carry-Over (VCO) 
Voice Carry Over