The University is in the process of implementing a change to the office phone (CHORUS) infrastructure to provide more functionality and efficiency.
The changes include moving users with personal numbers to Telephony over Teams (ToT) and removing the desk phones for these users. You will be able to use your current Teams client to make internal and external calls and receive calls as normal. The current webcam and headsets used currently will be compatible for Telephony over Teams as well.
Further information about this project can be found in here: https://projects.it.ox.ac.uk/chorus-infrastructure-upgrade
FAQs which can be relevant for general users can be found in here: https://help.it.ox.ac.uk/telephony-over-teams-guidance#collapse3428761