diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index c213e5622de98a9acaa2621be3e1eeea47c8ed8c..c44f31291e494fd60f4b5d22922f0acc65254fff 100755
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -2817,7 +2817,7 @@ static int transmit_invite(struct sip_pvt *p, char *cmd, int sdp, char *auth, ch
 		
 	if (auth)
 		add_header(&req, authheader, auth);
-
+	append_date(&req);
 	if (!strcasecmp(cmd, "REFER")) {
 		if (strlen(p->refer_to))
 			add_header(&req, "Refer-To", p->refer_to);