Ciscos HHC adapter provides support for remote answer/ end calling & ring tone signaling when used with a Jabra GN9350e, Jabra GN9120-EHS Series, & Jabra GN9125 Series wireless headsets. Current Cisco phone systems compatible with the HHC adapter include Ciscos 7975G, 7965G, 7945G, 7962G, & 7942G.