<![CDATA[<b>]]>**%1$s<![CDATA[</b>]]>**'s app is using an incompatible protocol. They need to update their app before you can call them.
Error when your chat partner's app is incompatible in terms of Telegram calls. Can't be reproduced in official clients.
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Aplicația lui **%1$s** folosește un protocol incompatibil. Trebuie să își actualizeze aplicația mai întâi.
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Nicolae,
Dec 11, 2018 at 13:15