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Adult African American female using the voice carry-over service.

Voice Carry-Over (VCO)

800-735-0135 for English 
800-520-7309 for Spanish

Voice Carry-Over (VCO) is the perfect solution for you if you like to talk and read captions during your phone calls. When the other party speaks to you, the communications assistant serves as your “ears” and types all the words that are spoken and background sounds, if any, on your VCO phone or text telephone/teletypewriter (TTY). Then you speak directly back to the other party.

This service is designed for the people who are Deaf or Hard of Hearing.

This relay service is available in English-to-English and English-to-Spanish/Spanish-to-English Translation.

The TRS Customer Profile allows you to store your relay call preferences and helps speed up call processing.

How Does Voice Carry-Over (VCO) Work?

It’s a snap!

Just dial 711 (or 800-735-0135 for English, 800-520-7309 for Spanish-to-Spanish or English-to-Spanish/Spanish-to-English Translation) on your VCO phone or text telephone/teletypewriter (TTY). The relay operator will answer with “Relay Missouri”.

Provide the area code and telephone number you wish to call and say “Go Ahead”. The relay operator will dial the number and connect you to the other party.


You speak to the other party. Say “Go Ahead” (“GA”) at end of each message. The “GA” indicates that it is the other party’s turn to respond.


The other party listens and speaks. The other party says “Go Ahead” (“GA”) to indicate that it is your turn to respond.


The communications assistant types the other party’s voiced message to you.


You read the other party’s voiced words on your VCO phone or text telephone/teletypewriter (TTY).

To conclude the call, just say “goodbye”.

A collage of images showing the steps of how voice carry-over works.

Other VCO Features

Please specify to the communications assistant the VCO call type you would like to make.


The communications assistant types what you, the VCO user, says to the TTY user. The TTY user types directly to your VCO phone.


The communications assistant serves as “ears” for both VCO users by typing what is said to both VCO phones and/or TTYs.

Two-Line VCO

Two-line VCO allows you, the VCO user, to use one telephone line for speaking directly to another party, and another telephone line to receive the other party’s typed responses. This feature provides a more natural flow of conversation and eliminates the need to say “Go Ahead” (“GA”).