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