Hearing Carry-Over (HCO) 1-800-750-0750 Hearing Carry Over (HCO) allows speech-disabled users with hearing capabilities to listen to the person they are calling. The HCO user types his/her conversation for the Communication Assistant (CA) to read to the standard telephone user.   Broad-Band | Dial-Up
HCO to TTY The HCO user listens while the CA voices the TTY user’s typed message. The HCO user types his/her conversation directly to the TTY user.
HCO to HCO HCO users may contact other HCO users through Ohio Relay. The CA will voice to both parties what is typed on each user’s TTY.