If you were to trace the wire attached to an ordinary telephone, it would lead you to a modular jack or a junction box, which is connected to the wiring in your house.
فإذا تبعتم سلك هاتفكم العادي ،‏ فستجدون انه يؤدي الى طرف توصيل نموذجي او صندوق توصيل متصل بشبكة الاسلاك في بيتكم .‏