Advanced → QoS/Security → Security → SBC
Enables using the 3CX SBC tunnel on the phone.
This setting is only working after the 3CX SBC feature update is installed on the phone. After this setting is set to on, the setting prov_3cxsbc_url can be set to fetch the 3CX SBC config file, which is needed to start a 3CX SBC tunnel.
This setting is only available on D8XX phones.