Index: main/rtp.c
===================================================================
--- main/rtp.c	(revision 152803)
+++ main/rtp.c	(working copy)
@@ -65,6 +65,8 @@
 #define RTP_MTU		1200
 
 #define DEFAULT_DTMF_TIMEOUT 3000	/*!< samples */
+#define DEFAULT_RTP_START    5000	/*!< Default first RTP port. */
+#define DEFAULT_RTP_END      31000	/*!< Default last RTP port. */
 
 static int dtmftimeout = DEFAULT_DTMF_TIMEOUT;
 
@@ -4696,12 +4698,17 @@
 	struct ast_flags config_flags = { reload ? CONFIG_FLAG_FILEUNCHANGED : 0 };
 
 	cfg = ast_config_load2("rtp.conf", "rtp", config_flags);
-	if (cfg == CONFIG_STATUS_FILEMISSING || cfg == CONFIG_STATUS_FILEUNCHANGED || cfg == CONFIG_STATUS_FILEINVALID) {
+	if (cfg == CONFIG_STATUS_FILEMISSING || cfg == CONFIG_STATUS_FILEINVALID) {
+		ast_log(LOG_WARNING, "Missing or invalid 'rtp.conf' file, defaulting port range to %d-%d\n", DEFAULT_RTP_START, DEFAULT_RTP_END); 
+		rtpstart = DEFAULT_RTP_START;
+		rtpend = DEFAULT_RTP_END;
 		return 0;
+	} else if (cfg == CONFIG_STATUS_FILEUNCHANGED) {
+		return 0;
 	}
 
-	rtpstart = 5000;
-	rtpend = 31000;
+	rtpstart = DEFAULT_RTP_START;
+	rtpend = DEFAULT_RTP_END;
 	dtmftimeout = DEFAULT_DTMF_TIMEOUT;
 	strictrtp = STRICT_RTP_OPEN;
 	if (cfg) {
@@ -4754,8 +4761,8 @@
 	}
 	if (rtpstart >= rtpend) {
 		ast_log(LOG_WARNING, "Unreasonable values for RTP start/end port in rtp.conf\n");
-		rtpstart = 5000;
-		rtpend = 31000;
+		rtpstart = DEFAULT_RTP_START;
+		rtpend = DEFAULT_RTP_END;
 	}
 	ast_verb(2, "RTP Allocating from port range %d -> %d\n", rtpstart, rtpend);
 	return 0;