I am in the process of putting together a replacement phone system to our old Toshiba system. We are leaning towards using 3CX because of the features for the price. But I am trying to figure out the best set of phones to use with 3CX. In the past I have used Cisco 79XX with asterisk/trixbox/elastix, and loved working with the phones. But after reading through the 3CX website, from what I can tell, the cisco 79xx phones aren't well supported with 3CX? I am wondering if you lose any features/functionality of the 79xx phones with 3CX? What are the feature differences between using 79xx phones vs the more supported Cisco SPA, Yealink, or Polycom phones with 3CX?