This sub-class includes: •activities of inbound call centres, such as: - answering calls from clients by using human operators - automatic call distribution, computer telephone integration, interactive voice response systems or similar methods to receive orders - providing product information, deal with customer requests for assistance or address customer complaints - web contact centres •activities of outbound call centres such as: - selling of market goods or services to potential customers - undertaking market research or public opinion polling and/or similar activities for clients