Lines to Harare, Zimbabwe, are also acceptable for data traffic and relatively easily obtained. They can be obtained during the day through the operator, and occasion- ally at night by IDD for computer use. Quality is variable. Determination of other possible routes has yet to take place, but the above mentioned form the most useful links and could in turn be used to route messages elsewhere. Hence lengthy routing.
Regional calls are about half that figure.
The optimum channels of communication have yet to be estab- lished, and not all sites are operational, although should be by mid 1992. However Unza has been running a trial system for some 9 months, and has launched it 'officially' for use by the academic community. This has also included the hold- ing of a number of seminars and publishing newsletters and information on the advantages and uses of the system. This proved effective but was very expen- sive to run due to the high telephone costs. The GreenNet connection has now been phased out in favour of routing through Rhodes University in South Africa.