As this is a 3rd party phone we do not provide Help Desk support, however we have a copy of the user manual that may assist you - please click on the link below:
http://ilink.to/i/Polycom_320_ 321_Desk_Phone_Quick_Guide.pdf
Any questions you have please revert back to the supplier where you purchased the phone from or contact Polycom Support on +44 (0)1753 723000.