Don't send Contact in SIP Messages (imported from 1.2/1.4).

Reported by Gunnar at Omnitor.


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@48318 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -5733,9 +5733,10 @@ static int reqprep(struct sip_request *req, struct sip_pvt *p, int sipmethod, in
 		add_header(req, "From", ot);
 		add_header(req, "To", of);
 	}
-	/* Do not add Contact for BYE and Cancel requests */
-	if (sipmethod != SIP_BYE && sipmethod != SIP_CANCEL)
+	/* Do not add Contact for MESSAGE, BYE and Cancel requests */
+	if (sipmethod != SIP_BYE && sipmethod != SIP_CANCEL && sipmethod != SIP_MESSAGE)
 		add_header(req, "Contact", p->our_contact);
+
 	copy_header(req, orig, "Call-ID");
 	add_header(req, "CSeq", tmp);