The wires should be firmly fastened with screws and all wires should be coated to avoid short circuit. Further, the connection should be neatly done to make the office look organized. After the connection is done, the telephones should be tested by making calls to determine the functionality. Programming the phone system follows, and this includes putting phone numbers and extensions and caller IDs. Cordless business phone systems are also available but are costly and unaffordable for most businesses.