Issue #6759, generate warning when refusing connection requiring unsupported SIP extensions

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@14110 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -10418,6 +10418,7 @@ static int handle_request_invite(struct sip_pvt *p, struct sip_request *req, int
 		if (required_profile) { 	/* They require something */
 			/* At this point we support no extensions, so fail */
 			transmit_response_with_unsupported(p, "420 Bad extension", req, required);
+			ast_log(LOG_WARNING,"Received SIP INVITE with unsupported required extension: %s\n", required);
 			if (!p->lastinvite)
 				ast_set_flag(p, SIP_NEEDDESTROY);	
 			return -1;