Canada is the latest market to target telemarketers with stringent new regulations.
Under the rules telemarketers must act immediately if customers make a "do-not-call" request and give them a code number as confirmation.
Telemarketers must also give customers the option of being removed from all their databases.
The rules, issued by industry regulator, the Canadian Radio-Television and Telecommunication Commission, come into force in October.
The commission decided against a national "do-not-call" system on cost grounds.
Data sourced from: The Wall Street Journal Online; additional content by WARC staff