Customer Premises Equipment (CPE) refers to the devices and equipment located on the customer's premises that connect to a service provider's network. This includes items like routers, modems, and telephones, which enable users to access services such as internet, telephony, and television. CPE is essential for facilitating communication and data transfer between the customer and the service provider. It can be owned by the customer or leased from the provider, and its proper functioning is crucial for ensuring reliable service delivery and performance in various applications, including VoIP and broadband services.