As of January 1, 2023, the City will be directing TTY service to TELUS TTY (711).

For TTY services:
1) Dial 711 from your TTY device
2) The TELUS Relay agent will answer by typing "TELUS RELAY SERVICE, THIS IS (agent's name & number)", followed by GA (for "go ahead")
3) Type 780-442-5311, then type GA
3) The TELUS Relay agent will dial the number and will let you know how the connection is progressing for example (ringing 1...2...3...), inform you when someone answers, and then give the person’s name (if provided) 

For more, see TELUS Relay Service.