The Jabra LINK Remote Electronic Hook Switch Control (EHS) with Jabra wireless headsets allows the user to hear ring tones, answer and end calls, adjust the speaker volume and mute the microphone directly from the headset when being used with a compatible phone.
Jabra EHS Adaptor, USB to AUX/RJ9- CA407 is specifically designed for use with the following Cisco phone models:
Cisco Unified IP Phone 8961
Cisco Unified IP Phone 9951
Cisco Unified IP Phone 9971
Not all Cisco telephones are engineered to use electronic hook switch cables.