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Business telephone systems don't like the telephone system that used in residence. Business telephone systems need more capability because it needs to handle more than one incoming and outgoing calls at the same time. So that can be used many public phone line to handle above duty but it is very expensive. In a business, cost is one fact to consider. Therefore, telephone systems can be used to overcome.
There are two types of telephone system for business: Private Branch Exchange (PBX) and Key Telephone System (KTS). The differences between of these systems are number of extension line and functions.
a) The main equipment that would be installed
1. Private Branch Exchange (PBX)
1) Phone System
PBX phone system is a device which is used to connect multiple public telephone lines (PSTN) to multiple public telephone lines (office telephone network) and to communicate employee using the private phone lines. That contains incoming (PSTN) line ports, internal extensions, power supply connection for getting power, LAN Ethernet connection, music on hold jack that used to connect music on hold player and USB port. Supported functions and connection ports can be different according to prices and models. Features can be added by using software, upgrading firmware or using add-on modules.
PBX phone is different with traditional telephone unit and that utilize a PBX system. PBX phone is used by the PBX operator and employees. Employees dial pre assigned number (three or four digit number) to communicate each others with private telephone network. Employees must dial access code before the target phone number to call public. Now a day, user can dial directly the public phone number without need access code. Traditional telephone can be used instead PBX phone but it can only receive
That used to give power for phone system.
2. Key Telephone System (KTS)
1) Key service unit
Service unit is central device that used to link public telephone line to private telephone network.
In the key telephone system, user chooses the outgoing line. Key telephone has display that shows the number of incoming call. It has 4 types of different keys- line keys, function keys, extension keys and number keys. User chooses the outgoing line by press line key. Function keys are used to activate features that have been programmed on the telephone set.
b) The features available with each system
1- Automated Attendant
Automated attendant allows user directly called to extension without mediation of operator. It also offers simple menu system.
Example - Press 1 for sales center, press 2 for service center,...... and press 0 to communicate with operators.
2- Abbreviated or Short code dialing
It allows users to dial directly an abbreviated code rather than the full number.
3- Call Barring
It is used to limit scope of dialed for extension line user. For example- outgoing call only, incoming call only, internal call only, local only, local and nation only and local plus nation and international.
4- Conference called
5- Call forwarding
Call forwarding, is a feature on some telephone networks that allows an incoming call to a called party, which would be otherwise unavailable, to be redirected to a mobile telephone or other telephone number where the desired called party is situated.
6- Call Parking
Call park is a feature of some telephone systems that allows a person to put a call on hold at one telephone set and continue the conversation from any other telephone set. The "call park" feature is activated by pressing a preprogrammed button (usually labelled "Call Park") or a special sequence of buttons. This transfers the current telephone conversation to an unused extension number and immediately puts the conversation on hold. (This is called parking the call; and the call is said to have parked onto a certain extension. Essentially, call parking temporarily assigns an extension number to an incoming call.) The telephone system will then display the extension number of the parked call so that the call can later be retrieved.