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The idea goes from Skype. It allows publishing links like skype:echo123?call on the website to make a call with one click. Telegram for Android has URL schema tg://call, but the parameter name opens Global Search as an extra action and the parameter phone works only for contacts. I suggest adding the parameter username which will work as phone for existing contacts: requesting permission to make a call right now. Telegram for iOS, Telegram Desktop and the native macOS app don't have URL schema tg://call at all. I suggest implementing it like on Android. Related issues on Github: https://github.com/TelegramMessenger/Telegram-iOS/issues/640 https://github.com/telegramdesktop/tdesktop/issues/17179 https://github.com/overtake/TelegramSwift/issues/696