We have been, they only use it for call intrude. It seems to cause a buildup over the course of the week of the channels getting more and more in use; a reboot generally clears this but then it starts all over again.
Seems to be getting worse as well. Some phones seem to be taking up a conference channel and when we intrude in on them there'll be three or so.
Want to test anything else that takes up a channel to see if its having the same effect. Changed the system, bumped in a fresh config etc
Nothing seems to be clearing it.