Index: channels/chan_sip.c
===================================================================
RCS file: /usr/cvsroot/asterisk/channels/chan_sip.c,v
retrieving revision 1.894
diff -u -r1.894 chan_sip.c
--- channels/chan_sip.c	17 Oct 2005 22:26:33 -0000	1.894
+++ channels/chan_sip.c	20 Oct 2005 09:07:21 -0000
@@ -3289,7 +3289,7 @@
 			*c = 0;
 
 			if (sipdebug && option_debug > 3)
-				ast_log(LOG_DEBUG, "Header: %s (%d)\n", req->header[f], (int) strlen(req->header[f]));
+				ast_log(LOG_DEBUG, "Header %d: %s (%d)\n", f, req->header[f], (int) strlen(req->header[f]));
 			if (ast_strlen_zero(req->header[f])) {
 				/* Line by itself means we're now in content */
 				c++;
@@ -3307,8 +3307,11 @@
 		c++;
 	}
 	/* Check for last header */
-	if (!ast_strlen_zero(req->header[f])) 
+	if (!ast_strlen_zero(req->header[f])) {
+		if (sipdebug && option_debug > 3)
+			ast_log(LOG_DEBUG, "Header %d: %s (%d)\n", f, req->header[f], (int) strlen(req->header[f]));
 		f++;
+	}
 	req->headers = f;
 	/* Now we process any mime content */
 	f = 0;
@@ -10798,6 +10801,7 @@
 	char iabuf[INET_ADDRSTRLEN];
 	int debug = sip_debug_test_pvt(p);
 	char *e;
+	int error = 0;
 
 	/* Clear out potential response */
 	memset(&resp, 0, sizeof(resp));
@@ -10807,10 +10811,17 @@
 	cmd = req->header[0];
 
 	/* Must have Cseq */
-	if (ast_strlen_zero(cmd) || ast_strlen_zero(cseq))
-		return -1;
-	if (sscanf(cseq, "%d%n", &seqno, &len) != 1) {
-		ast_log(LOG_DEBUG, "No seqno in '%s'\n", cmd);
+	if (ast_strlen_zero(cmd) || ast_strlen_zero(cseq)) {
+		ast_log(LOG_ERROR, "Missing Cseq. Dropping this SIP message, it's incomplete.\n");
+		error = 1;
+	}
+	if (!error && sscanf(cseq, "%d%n", &seqno, &len) != 1) {
+		ast_log(LOG_ERROR, "No seqno in '%s'. Dropping incomplete message.\n", cmd);
+		error = 1;
+	}
+	if (error) {
+		if (!p->initreq.header)	/* New call */
+			ast_set_flag(p, SIP_NEEDDESTROY);	/* Make sure we destroy this dialog */
 		return -1;
 	}
 	/* Get the command XXX */
@@ -10996,6 +11007,9 @@
 			ast_log(LOG_WARNING, "Recv error: %s\n", strerror(errno));
 		return 1;
 	}
+	if (res == sizeof(req.data)) {
+		ast_log(LOG_DEBUG, "Received packet exceeds buffer. Data is possibly lost\n");
+	}
 	req.data[res] = '\0';
 	req.len = res;
 	if(sip_debug_test_addr(&sin))
@@ -11042,7 +11056,11 @@
 			append_history(p, "Rx", tmp);
 		}
 		nounlock = 0;
-		handle_request(p, &req, &sin, &recount, &nounlock);
+		if (handle_request(p, &req, &sin, &recount, &nounlock) == -1) {
+			/* Request failed */
+			ast_log(LOG_DEBUG, "SIP message could not be handled, bad request: %-70.70s\n", p->callid[0] ? p->callid : "<no callid>");
+		}
+		
 		if (p->owner && !nounlock)
 			ast_mutex_unlock(&p->owner->lock);
 		ast_mutex_unlock(&p->lock);