Explain usage of DEFAULT_SIP_PORT

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@44706 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -450,7 +450,7 @@ static const struct cfsip_options {
    sip.conf.sample for new installations. These may differ to keep backwards compatibility,
    yet encouraging new behaviour on new installations 
  */
-#define DEFAULT_SIP_PORT	5060	/*!< From RFC 3261 (former 2543) */
+#define DEFAULT_SIP_PORT	5060	/*!< Our default port to listen to. From RFC 3261 (former 2543) */
 #define DEFAULT_CONTEXT		"default"
 #define DEFAULT_MOHINTERPRET    "default"
 #define DEFAULT_MOHSUGGEST      ""