Function send_message

pub fn send_message<F>(
    message_type: &str,
    message_content: &str,
    recipient: &str,
    recipient_type: &RecipientType,
    recipient_uri: &str,
    message_result_callback: F,
    core: Arc<SipCore>,
    transport: &Arc<SipTransport>,
    public_user_identity: &str,
    rt: &Arc<Runtime>,
)
where
    F: FnOnce(u16, String) + Send + Sync + 'static,