Contact Us
National Headquarters Ottawa:
CSIS
PO BOX 9732 STN T
OTTAWA ON K1G 4G4
Telephone: 613-993-9620
For people who are deaf or hard of hearing:
TTY and/or TDD *: 613-991-9228
* A TTY --or Teletypewriter, also known as a TDD or Telecommunications device for the deaf-- is a special device that lets people who are deaf, hard of hearing, or speech-impaired use the telephone to communicate, by allowing them to type messages back and forth to one another instead of talking and listening. A TTY is required at both ends of the conversation in order to communicate.
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