<![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 👉 can 📱 them.
100/105
Jannik,
Dec 19, 2018 at 18:30