diff --git a/channels/chan_sip.c b/channels/chan_sip.c
index b130190bd2..83b74cd509 100755
--- a/channels/chan_sip.c
+++ b/channels/chan_sip.c
@@ -3765,7 +3765,7 @@ static int transmit_invite(struct sip_pvt *p, char *cmd, int sdp, char *auth, ch
 #endif
 	if (distinctive_ring && !ast_strlen_zero(distinctive_ring))
 	{
-		add_header(&req, "Alert-info",distinctive_ring);
+		add_header(&req, "Alert-Info",distinctive_ring);
 	}
 	add_header(&req, "Allow", ALLOWED_METHODS);
 	if (sdp) {