Telephone/Telecommunication Relay Services (TTY)

Telecommunication Relay Service equipmentTelecommunications Relay Service, also known as TRS, Relay Service, or IP-Relay, is an operator service that allows Deaf, Hard-of-Hearing, Speech-Impaired, and Speech-Disabled persons to place calls to standard telephone users via TDD, TTY, personal computer or other assistive telephone device.

Most TRS operators use regular keyboards to transcribe spoken voice as text for relaying. However, some TRS services may use stenotype or stenomask equipment, similar to those used by court reporters and closed captioning systems.

National TRS Number: 711

Just as you can dial 411 for information, you can dial 711 to access all telecommunications relay services anywhere in the United States. The relay service is free.

Arizona TRS Providers:

MCI (Verizon)
Access Numbers:
Voice: 800-842-4681
TRS: 800-367-8939
STS: 1-800-842-6520

Customer Service Numbers:
Voice: 800-896-3686
TRS: 800-347-1695
1130 E. University Drive
Suite 212
Tempe, AZ 85281

California TRS Providers:

DDTP (Traditional Relay)

English Access numbers:
TTY/VCO/HCO/ASCII: (800) 735-2929
Voice: (800) 735-2922
STS: (800) 854-7784

Spanish Access numbers:
TTY/VCO/HCO/ASCII/Voice: (800) 855-3000
STS: (800) 854-7784

AT&T Relay (Traditional Relay)

English Access numbers:
TTY/VCO/HCO/ASCII: (866) 660-4288
Voice: (866) 461-4288
STS: (866) 988-4288
Customer Service: (866) 934-4288
STS Customer Service: (866) 288-1909
STS User Training Line: (866) 844-2626

Spanish Access numbers:
TTY/VCO/HCO/ASCII: (866) 288-1311
Voice: (866) 288-1677
STS: (866) 288-7504
Customer Service: (866) 985-4288
STS Customer Service: (866) 288-4151

Hamilton Relay (Traditional Relay)

English Access numbers:
TTY/VCO/HCO/ASCII/Voice: (800) 855-7100
STS: (800) 855-7300
Customer Service: (877) 632-9095
STS User Training Line: (877) 632-9095

Spanish Access numbers:
TTY/VCO/HCO/ASCII/Voice/STS: (800) 855-7200
Customer Service: (877) 419-8440
STS User Training Line: (877) 419-8440

Captioned Telephone Service

English Access numbers:
Voice: (866) 399-9050
Customer Service: (888) 402-4018

Spanish Access numbers:
Voice: (866) 399-9090
Customer Service: (877) 330-0156

DDTP Consumer Affairs

Voice: (877) 546-7414
TTY: (800) 867-4323
Fax: (510) 271-8324

Deaf and Disabled Telecommunications Program
1333 Broadway
Suite 500
Oakland, CA 94612

Guam and Pacific Basin TRS Providers:

Dial 711 for GTA Telecommunication Relay Services

Hawaii TRS Providers:

Access Numbers:
1-800-877-8973 Voice/TTY/ASCII
1-877-826-2255 VCO (1-TRS>-VCO-CALL)
1-800-435-8590 Spanish
1-800-855-4000 Sprint TTY Operator Services

Nevada TRS Providers:


Access Numbers:
V: 800-326-6888
T: 800-326-6868
STS: 1-888-326-5658

Customer Service Numbers:
Voice/Telephone: 800-676-3777

1099 18th Street, Suite 1400
Denver, CO 80202

What To Do If You Have a Telephone Relay Complaint

If you have a problem with the equipment or distribution process, check your local telephone bill for the correct telephone number to call.

If you have a problem with the Relay Service, call the Customer Service number for your CRS provider.

If you are unable to resolve your complaint, you may file a complaint with the FCC (Federal Communications Commission)

Glossary of Terms

American Standard Code for Information Interexchange
Hearing Carry-over
Speech to Speech
Telecommunications Device for the Deaf (see also: TTY)
Telecommunications Relay Service
Text Telephone (see also TDD, TTY)
TeleTYpe (see also: TDD)
Voice Carry-over