<![CDATA[<b>]]>**%1$s<![CDATA[</b>]]>**'s app is using an incompatible protocol. They need to update their app before you can call them.
Error when your chat partner's app is incompatible in terms of Telegram calls. Can't be reproduced in official clients.
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**%1$s**ning ilovasi mos kelmaydigan protokoldan foydalanmoqda. Siz qoʻngʻiroq qila olishingiz uchun foydalanuvchi ilovasini yangilashi lozim.
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Olim Abduvokhidov,
Jan 11, 2019 at 16:29