Just a quick note (Ha Ha). If you are having problems with the menu disappearing before the users can make a choice, there is a timer you can set to keep it on the screen longer. Also if the menu disappears you can press the --> Arrow key to pop it back up.
Also note that depending on how you have your phone set up, the HOLD button can be a dangerous thing on the 4K! It does not behave like the HOLD of days gone by.
If you have a phone with one line key only the HOLD button should work as expected.
If you have multiple LINE keys on your phone it will NOT.
If you are talking to one caller and a call is ringing in on another line you should NOT press HOLD. You should ask the first caller to wait, and then just press the LINE key of the incoming call. That will put the first person on a "soft" hold and you will be speaking to the second caller. Now if you want to ask them to wait so you can finish up your call with the first person you will now choose "Toggle" or "Connect" or "Return to Held Call" to switch back to the original caller. You can continue to switch back and forth as needed if necessary. When you are done with the first person and they hang up and drop off you can then "Return to Held call" or "Connect" to get the other person back.
If you are talking to one caller and you need to dial out to someone to ask a question, schedule a test, etc, then you should push Consult (to consult with another person). Consult will put your caller on "soft" hold and give you a new dial tone so you can call out. If the person you call does not answer or you need to get back to the first caller you can "Return to Held Call" or "Toggle" or "Connect". If the person doesn't answer "Return to Held Call" is the best choice because the other call that failed will drop off, and "Toggle" or "Connect" are the best choices if you have to go back and forth between parties.
If you are talking to one caller and another call comes in on a second line, and you press HOLD to put the first call on hold, and then you press the Line button of the ringing call you will immediately DISCONNECT the person you put on hold and be talking solely to the second caller.
In some cases, especially with nurses that "don't have time for that $hit", a little education can make their lives a whole lot simpler instead of trying to enable their wrong behavior by adding Hold buttons!! I work for a healthcare network that has close to 1000 IP devices and I have been around the block on these issues MANY times!!

) Your buttons on the phone are valuable commodities - don't waste them by adding buttons you don't need. Look at your menus - they are VERY intuitive. When you receive a phone call the automatic choice on the menu is "Do you want to transfer this person?". So if you do all you have to do is hit OK and dial the digits - no need to waste a button. If you consult with someone and the person doesn't answer, the menu is already asking you "Return to Held Call?" - all you have to do is hit OK. If you want a different choice they are usually laid out so one up arrow or one down arrow is the next most popular choice - so you hit that and OK to put a person on Hold, for example. There is very little wasted time!!
Hope this is useful to someone.
Don Bruechert, Voice Comm Analyst II
CareTech Solutions @ Holy Family Memorial
Manitowoc, WI, USA