Recently had an issue with Jabra headsets leaking sound through both the Headset and Handset. I believe this was just for outgoing calls but cannot confirm.

I first thought this was a bug and found this:

Turns out its the default behavior of Cisco phones to do this with a headset. To Disable you need to do the following:

Router(config-telephony)#service phone handsetHeadsetMonitor 0
Router(config-telephony)#create cnf-files

Restart the phones for this to work!

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