mredd97,
It sounds like you have Camp-On indications turned on and if you are in a Hunt Group then you may also have the Hunt Group Audio Camp-On indication turned on as well.
Turning off the normal Camp-On Inidications will turn off both and turning off just the Hunt Group indications will just turn it off for Hunt Group calls.
There are many 3rd party headsets that work with the 5320e, but a Plantronics headset is what most of our customers get. Ask your service provider to help you get one that will work best for you.
Thanks,
TE