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Digital networks 
have been developed which are better able to support data transmission than the older 
analogue networks, with 
higher transmission speeds 
and 
less likelihood of data corruption
.
2.3 Voice messaging systems 
Voice messaging systems answer and route telephone calls. Typically, when a call is answered a 
recorded message 
tells the caller to dial the extension required, or to hold if they want to speak to the 
operator.
2.4 Computer bulletin boards 
A computer bulletin board consists of a central mailbox or area on a computer server where people can 
deposit messages
for everyone to see and, in turn, 
read what other people have left 
in the system.
Bulletin boards can be appropriate for a team of individuals at different locations to compare notes. It 
becomes a way of keeping track of progress on a 
project 
between routine team meetings. 
2.5 Videoconferencing 
Videoconferencing is the use of computer and communications technology to 
conduct meetings
. 
Videoconferencing has become increasingly common as the internet and webcams have brought the 
service to desktop PCs at reasonable cost. More expensive systems feature a 
separate room with several 
video screens
, which show the images of those participating in a meeting.
2.6 Electronic Data Interchange (EDI) 
EDI is a form of computer-to-computer 
data 
interchange. Instead of sending each other reams of paper 
in the form of invoices, statements, and so on, details of inter-company transactions are sent via 
telecoms links, 
avoiding the need for output 
and paper at the sending end, and
 for re-keying of data 
at 
the receiving end. 
2.7 Deciding on a communication tool 
The