The ringtone is set on the phone locally. You can adjust it in the settings. I can't give you more details as you have provided barely any. What type of phone do you have? It would have come with instructions, or you can google the model to find a manual online.
This reply was created from a merged topic originally titled Differentiating Ring Tones. Our office has the Polycom 400 series. Can I set up so when someone calls the office it is one type of ringtone, and when we send a call into an individual office it is a different type of ringtone? I don't want to set up for individual contacts, just each person sitting at each desk can have a distinct ring tone different from the main line.