maybe microsfot update ?
maybe screensaver on computer ?
did you change the COS of the micollab siphone user ?
Recent Microsoft updates weren't installed however we have since installed them on Tuesday to see if that fixed it (to no avail)
We don't have screensavers, just a group policy to lock screens but that hasn't changed.
No changes to COS however I have an update - I uninstalled 9.1 and installed 7.3 and I can use the headset as normal.
I have since reinstalled 9.1 and back to the problem again.
I can't pinpoint what happened Friday for this to stop working....