HUD not refreshing or showing correct presence on Softphone

1. Account Type: US
2. Related Case Number: 06065930
3. I am having an issue with my HUD not displaying extensions presence correctly. Some users show as having multiple calls, others showing as being on the line when I know they're not, others show that their extension is ringing when it's not. It's causing a lot of miscommunication and missed calls. This has been an issue before, we called and created a case number but now it seems to be happening again. 

I have already gone through all the network configurations and checked all the settings on the routers and firewalls. 

4. Resolution, I'd like the HUD to work properly!
5. See 3.
6. 9.1.6.27106
7. Does not apply.
8. 15 users, all using the softphone