Until recently Oxford University Telecomms Network (OUTN) sent out a generic number as a CLI on all calls, no matter what extension the call was made from. When this number was rung back using 1471 it was answered by a recorded message giving an explanation of the system. This overcame the problem of anonymous call rejection (ACR) but did not provide very helpful information to the recipient of the call.
Nowadays OUTN presents the actual DDI number of the extension making the call, so that, for example, recipients of calls from extension 88661, who dialled 1471, would be told that they had been rung by 01865 288661, and could recall directly by dialling 3.
However, there is a valid requirement for some staff not to allow their extension number to be generally known. Staff are already allowed to be ex-directory** and some people who work in sensitive and/or secure areas have taken up this option. It is regarded as essential that staff who have concerns about revealing their individual telephone numbers can also suppress information about them whenever they make an outbound call.
Requests for CLI suppresion should be addressed to your Telecommunications Co-ordinator (who is normally your Departmental Administrator or Home Bursar), and please not directly to the Telecommunications Section. Ask your Head of Department to signify approval if appropriate. The Telecommunications Co-ordinator should then Email us with the details of the extension number requiring CLI suppresion.