Hi Jose, If you have an Apple IOS 7 device and the application yes it should work fine with an SX20 locally even without being in a call as long as you display a presentation. I recommend you read the FAQ page here https://supportforums.cisco.com/document/12159326/frequently-asked-questions-cisco-proximity if you run into problems. Here are the requirements to get it up and running (from the FAQ): What are the requirements for Cisco Proximity to work with the endpoint? In order for the Cisco Proximity to work with the endpoint you have to enable BYOD mode on the endpoint. xConfiguration Experimental Byod Mode: On xConfiguration NetworkServices HTTPS Mode: On This will make the unit generate the ultrasound for pairing and open up for HTTPS communication. This also means that the device running the Cisco Proximity app must be on a network where it can reach the endpoint on HTTPS in order make it work. Make sure the endpoint are using speakers. The pairing will not work if headphones are connected to the audio output. The speakers must also be capable of generating a 22Khz tone. Regards John ... View more