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Telephone cables are used to transmit audio signals over long distances through a wired connection. These cables are typically made of copper or fiber optic materials and are insulated to protect against interference and ensure clear communication. They are commonly used in telecommunications systems to connect telephones, fax machines, and modems to a network or telephone line. Telephone cables come in various types, such as twisted pair cables, coaxial cables, and fiber optic cables, each designed for specific communication needs.