When I got a call during a call, instead of Approve or Deny, I had a choice of "drop the current call" as in hang up on the person I originally was talking to, then start a new conversation with the second person; or "hold the current call" which will allow me later to switch back to the first person, or join all three people at once.

Different wording but it is the same function. The 8700c lets you put a current caller on hold to answer a new call, alternate between the two (placing one on hold), or set up a three way conference call (join).

Difference is the wording seems to have changed between the 8800 and the 8700.