This sound is from Phones & Cell Phones Sounds

Telephone calls are initiated most commonly with a keypad or dial, affixed to the telephone, to enter a phone number. Other methods existed in the early history of the telephone. A telephone converts sound, typically and most efficiently the human voice, into electronic signals that are transmitted via cables and other communication channels.
See also: Mobile phone, Smartphone, Phones 4u, Oppo phones, Windows Phone, Satellite phone.