<![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**ın tətbiqi uyğun olmayan protokol işlədir. O siz ona zəng edə bilməniz üçün tətbiqi yeniləməlidir.
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Kamran,
Oct 15, 2018 at 19:40