Add template specialisations for voip events

include/mtx/events/collections.hpp

@@ -163,6 +163,15 @@ template<>
 constexpr EventType message_content_to_type<mtx::events::msg::Video> = EventType::RoomMessage;
 template<>
 constexpr EventType message_content_to_type<mtx::events::msg::StickerImage> = EventType::Sticker;
+template<>
+constexpr EventType message_content_to_type<mtx::events::msg::CallInvite> = EventType::CallInvite;
+template<>
+constexpr EventType message_content_to_type<mtx::events::msg::CallCandidates> =
+  EventType::CallCandidates;
+template<>
+constexpr EventType message_content_to_type<mtx::events::msg::CallAnswer> = EventType::CallAnswer;
+template<>
+constexpr EventType message_content_to_type<mtx::events::msg::CallHangUp> = EventType::CallHangUp;
 
 template<typename Content>
 constexpr EventType state_content_to_type = EventType::Unsupported;