This is a service that businesses and residential telephone customers can sign up for.
It means they opt out of receiving "cold" or unsolicited sales calls.
On June 1st 2004 it became law that any company making unsolicited outbound calls to companies and businesses, need to screen their calls for the list of Telephone Preference Service (TPS) members.
Rather than buy expensive software that has to be constantly updated as the list changes, why not have your calls least cost routed through ECS Telecoms. This service* automatically screens the numbers you are dialling through the latest TPS software so you can be sure you won't call anyone who has opted in to TPS.
You can be safe in the knowledge you are not breaking the law and are making substantial savings on your calls.
* When ordering please stipulate that you require TPS