<![CDATA[<b>]]>**%1$s<![CDATA[</b>]]>**'s app is using an incompatible protocol. They need to update their app before you can call them.
Error when your chat partner's app is incompatible in terms of Telegram calls. Can't be reproduced in official clients.
105
La app de **%1$s** está usando un protocolo incompatible. Necesita actualizar la app para poder llamar.
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Fair Puma,
Oct 10, 2017 at 18:29