Communication / Telecom systems



These type of systems usually have most of these basic features :
Making intercom calls
Receiving intercom calls
Making MTNL calls from authorised extensions
Receiving MTNL calls on preprogrammed extensions
Toll Restriction of select extensions
Music on hold
External Music port
Call transfer
Call pick up
Hold call and consult
Call camp on
Call Forwarding
Follow me
Uninterrupted power supply with external batteries


Advanced telecom systems usually have all the basic features of simple systems, and in addition they may have (some of) the following features.
These features are designed to:
  • impress those who call you on this telecom system,
  • control possible mis-use,
  • and improve ease and efficiency
Auto Attendant - an automatic operator feature to handle the incoming calls. This can be recorded with your VOICE MESSAGES to greet the caller, announce the name of your organisation, and guide the caller further in order to reach the desired extension. A MATUREauto-attendant usually has a provision to record at least the BASIC FOUR MESSAGES namely greeting message, message on busy extension, message on no-reply of extension and release message. It may also have the capability of RE-TRYING the desired extension when it is not immediately available. Older IMMATURE versions (called Voice DISA) with only greeting message are also available at lesser cost.
Keyphone Console - Provision to connect a KEYPHONE as a 'Masterphone' or 'Operator Console' to handle higher telephone traffic.
Caller-ID - Capability to read CALLER-ID or Calling Party's Telephone Number as per data provided by MTNL / BSNL line and show on:-
  • ringing extensions,
  • on extensions where call is transferred,
  • in call billing data.
Extensions may use normal CALLER-ID phones or keyphones
Additional features may include:
  • CALL BILLING with buffer memory and COMPUTER INTERFACE
  • Auto- Redial
  • Dynamic Locking
  • Console Never Busy
  • Fax Homing
  • External Call Forwarding
  • Remote Programming
  • DOSA
  • Auto Disconnection after set interval
  • Call Budgeting


  • These systems are designed for providing connectivity to digital high speed ISDN lines, and are more expensive.
  • Caller-ID and other features offered by ISDN type of lines such as Direct Dial-in, Multi-subscriber number are supported by these systems.
  • These are more useful to software companies or organisations who need connectivity toISDN BRI/PRI lines on their telecom systems.
  • Organisations who need connectivity to 20 or more trunk lines and who are not very conservative about their budget, must buy these type of telecom systems.


These telecom systems support connectivity to VOIP trunk lines. They can interface with the IP network and take your digitized voice over the IP network at very economical rates.
These telephone systems usually provide a LAN port for Computer-Telephony Integration . They usually provide a PC-Console or a Soft-phone , which gives a Digital Key-phone like window on one's PC, and one can get the convenience of expensive Digital phones without buying them.
Organisations who are more concerned about using state-of-the-art technology and not very conservative about their budget, must buy these type of telecom systems.


Telecom systems supporting CTI usually provide a LAN port which enables to integrate the system with the computer LAN and provide CTI i.e. computer-telephony integration. With CTI, the telecom system can exchange data with your computer network. One can map your PC with your extension number, thereby making a pair. With CTI, while receiving incoming calls of regular callers like customers or suppliers, you can have POP-UP screens on your PC, providing all available information about the caller, so that you can have a more meaningful discussion with the caller.


It is an EPABX based or computer based "answering machine", which can be used for answering your calls when you are not available. It can be set up as a "single user" or "multiple users" option with each user having a separate private mailbox with a personal password. Voice guidance messages guide a caller to the respective mailbox and the voice mail messages of that person are saved in that mailbox. The owner of the mailbox, who can access this playback function using his secret password, can play these messages back.

A PC can be hooked up to the telecom system if it has a RS232C serial port on the output of the call billing buffer memory. The PC needs to have an extra COM port. All the call billing data from the telecom system can be transported to the PC's hard disc so that it can be merged with the data thus obtained for the previous and the later periods. This data may be used for analysis of calls made and costs incurred, independently or along with your other applications. This helps to control your telephone bills, and is useful especially if you have many STD / ISD lines. 
Instead of a PC you can take print-out of call billing on a printer from the parallel port.