Function create_call 

pub async fn create_call(
    user_id: i64,
    protocol: CallProtocol,
    is_video: bool,
    client_id: i32,
) -> Result<CallId, Error>

Creates a new call

Arguments

• user_id - Identifier of the user to be called
• protocol - The call protocols supported by the application
• is_video - Pass true to create a video call
• client_id - The client id to send the request to