We need functionality. For example, a call was received on a mobile phone and the call is automatically answered and the speakerphone is turned on, then a call is made to Telegram at the same time and the speakerphone in the application is also turned on. The point is that on the speakerphone it will be possible to communicate as with a conference call, i.e. it will be possible to combine a mobile call and a call through the telegram application.