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If you would like to push a button that starts a Intercom request and finish it by pushing the BLF button of a particular extension, you can do this on the Yealink phone.

Under the line key setting, choose the PREFIX option. Then add *90 in the value, you can also add the word Intercom in the description field and then confirm. Once this is done, you can press this button and then press and BLF button monitoring a extension to transfer the call and activate the called extensions speakerphone.

This will be available in system Auto Provisioning with future upgrades.