To activate EHS for Cisco Model: SPA Series
(UC520, UC540 UC560 PHONE PLATFORMS WORK WITH THE CISCO SPA PHONES)
MUST enable through the Cisco UC web portal only, EHS settings unavailable through phone menu.
Having a Cisco tech is recommended. This is not for the end user to enable.
First upgrade phone firmware to release 7.5.4 or later.
Verify following command is set in UC platform in command line interface.
Type Config T press ENTER
Type the following command in config mode under telephony
UC_560(config-telephony)#service phone ehookEnable 1
Go to phone IP address web page under user set electronic hookswitch control to yes
NOTE: This Setting cannot be changed by the Customer. If it is disabled and the Customer cannot change it, then they should contact their phone service provider for assistance.