In today's world the telephone has become the most necessary medium of interaction. Telephones are widely used all over the world generally for domestic usage or might be for workplace usage. In case of Office Phone Systems, the system is so created that it enables its user to share the very same external telephone lines rather than utilising specific telephones. These telephone systems are primarily created for several phone users at a single location. By utilising these kinds of phone systems lots of money can be saved as it is extremely cost efficient in comparison to any other phone systems.