diff --git a/src/sipsess/info.c b/src/sipsess/info.c
index 725a190..5fa845f 100644
--- a/src/sipsess/info.c
+++ b/src/sipsess/info.c
@@ -107,6 +107,9 @@ int sipsess_info(struct sipsess *sess, const char *ctype, struct mbuf *body,
 	if (!sess || sess->terminated || !ctype || !body)
 		return EINVAL;
 
+	if (!sip_dialog_established(sess->dlg))
+		return ENOTCONN;
+
 	err = sipsess_request_alloc(&req, sess, ctype, body, resph, arg);
 	if (err)
 		return err;