You can check the extension and external call numbers by dialing 78-27878. A recorded voice tells you the numbers. Calls to 0870 numbers are charged at national rate. The extension and 0870 numbers have to be linked with particular rooms. If you change rooms you will have to change phone numbers.
Every phone has a voice mailbox to receive unanswered calls.
You can check your messages from any phone. The phone point is a standard UK type 6 pin socket with the retaining clip on the right. You plug the modem of your PC into the socket and call your favourite Internet Service Provider. The 78 link is dedicated to welfare, security, and business use, but the University's V90 modem service can be accessed by dialling 60000. The agreement with ntl includes internet service with free rental, free email ids, free web space, and low rate calls.