Thanks for your review. Your headset can connect to mobile and to PC (via the included dongle) as is. There is also a solution if you'd like to connect to a desk phone. The Voyager Office Base adds this connectivity. However, before finalising a purchase, please get in touch with your model telephone so we can check compatibility for you.
https://www.simplyheadsets.com.au/plantronics-poly-voyager-uc-office-base-for-4300-focus-2-teams.html
“What an amazing product, very easy to set up and super comfy on the ears. We are very pleased with our purchase and would recommend both these headsets to all our work colleagues, family and friends.”