Index: channels/chan_sip.c
===================================================================
RCS file: /usr/cvsroot/asterisk/channels/chan_sip.c,v
retrieving revision 1.267
diff -u -r1.267 chan_sip.c
--- channels/chan_sip.c	10 Jan 2004 21:19:56 -0000	1.267
+++ channels/chan_sip.c	11 Jan 2004 17:43:10 -0000
@@ -4114,7 +4114,11 @@
 		y = 0;
 	for (x=0;x<req->lines;x++) {
 		strncat(buf, req->line[x], y);
-		strcat(buf, "\n");
+		y -= strlen(req->line[x]) + 1;
+		if (y < 0)
+			y = 0;
+		if (y != 0)
+			strcat(buf, "\n");
 	}
 	return 0;
 }