The Jabra Link 14201-43 Electronic Hook Switch (EHS) module enables wireless headset users to place or receive calls without the need to lift the handset of your Cisco phones. 

Phones Supported ( but ONLY with the Jabra headsets listed below):

Cisco Unified IP phone 6945, 78xx, 79xx and 88xx series.

Jabra Headsets Supported (but ONLY using the Cisco phones listed above):

Jabra Pro 920, Jabra PRO 9450, Jabra PRO 9460, Jabra PRO 9465, Jabra PRO 9470 and Jabra GO 6470.

Warning:

• For 8861, 8961, 8811 and 99xx Cisco phones use the Jabra Link 14201-30 EHS.
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Please Note:

Cisco 8861  & Cisco 8865 must be enabled in Cisco Call Manager for the EHS function to work. Without this setting change the telephones do not recognize the cable.