Making and receiving phone calls

When you phone is set up your head of department decides what type of calls you can make, for example, whether or not you can make international calls. Find out more about this, voicemail and making personal calls.

Classes of service

When your phone is set up for you, it's given a class of service. Your head of department does this. This is to set what phone calls you can make from it, and when. The table below shows you the different classes that are available. If you need to change the class of service, contact your head of department (or nominee).

The main classes of service are:

Category of call
1* internal
all times
2 Internal and 9-112 (9-999) all times
3 Local
Internal and 9-112 (9-999)
Mon-Fri 8am-6pm
At all other times
5 National
Local and Internal
Mon-Fri 8am-6pm
At all other times
6 Local all times
7 National all times
8 International all times
9 Unrestricted all times

* Barred from making or receiving any calls whatsoever over the public network


  1. Internal calls include calls over tie-lines connected to the system
  2. Direct Dialling In (DDI)

All classes of service (with the exception of Class 1) are able to receive incoming DDI calls at all times provided that the DDI facility is allocated to the extension.

Making personal phone calls

If you want to use your extension telephones to make personal calls, precede the number to be called with 701 (instead of 9). For example, to call 01933 774233 dial 701 01933 774233. Departments can recover the cost of personal calls on a monthly basis using the 'private' call cost print-out supplied.


There is a quick Voicemail Guide available.


Due to the size of the telephone system, neither the Switchboard nor the Security Service are able to handle routine telephone messages for departments or for individual members of staff.