| Instant two way voice communication between two | | | | systems. This system has a wide range of features. |
| people through a device is referred to as a phone | | | | Multiple line phone system: |
| system. With the development of modern | | | | Medium or huge phone traffic is required to use this |
| technology now it is possible for more than two | | | | system, where deals are needed to make effective. |
| people to communicate at the same time. | | | | Two or more than two extension can be installed. A |
| Conversation among more than two people is | | | | recording system can also be attached in these |
| referred as a conference call. These systems present | | | | systems. |
| a broad entrée to people all over the world. | | | | Private branch exchange system |
| Voice mail, caller identification, call transferring, call | | | | This system is equally beneficial for both medium and |
| waiting and many other features are now available in | | | | large companies as it consists of a large range of |
| modern systems. Varieties of integral systems are | | | | features. |
| available. Some of them are: | | | | Some more phone systems must also be discussed:o |
| Single-line Phones: | | | | KSU less system is suitable for those who want an |
| This is the most common type and is used in the | | | | extension range of 10 lines. It is an easy installation |
| home or at the domestic level. A telephone may be | | | | and economical.o PBX system has 40 extensions and |
| purchased from any appliance store. It is not capable | | | | is used by large companies. Its installation requires |
| of call transferring but this system can be easily | | | | less space.o Key system is supposed to be the best |
| installed by a local phone company. | | | | between the two as described above. It consists of |
| Multiple-line for bulky business: | | | | 4-40 extensions.o Key hybrid and PBX is latest and |
| Bulk business means people over 25 working in same | | | | flexible. Software is required for its working. |
| office need to communicate and is done by multi-line | | | | |