Her desk phone would ring even when using the headset, so it would ring in both.
Burst still covered up what people were saying so that doesn't work.
Turned off camp-on notifications, but now the physical phone doesn't ring. so that doesn't work.
After trying various options and nothing was satisfying them, they mentioned that if they are on the line with someone, they rarely put them on hold to grab the next call. so i just made it so if they are busy it goes to voicemail.
Now the ringing is not a problem.
Any ways, Thanks for the help.