Step 1Connect the Plantronics APC-41, APc-42 or APC-43 Hook Switch into the back of your Plantronics CS540 (C054) charging base.
Connect the headset extension cord (HA10350) into the headset port of your Cisco desk phone. *This extension cord is required when you have a Cisco sidecar connecting a Plantronics Hook Switch.
Step 3Connect one end of the Plantronics APC Electronic Hook Switch cable into the HA10350 extension cord.
Step 4Plug the other end of your Plantronics Hook Switch cable into the Aux port on your Cisco sidecar.
**For other helpful setup guides visit the Plantronics CS540 headset setup resource center*