Change strictrtp option to default to yes in the RTP module

Suggested by Kapejod on Facebook

Review: https://reviewboard.asterisk.org/r/1448/
(closes issue ASTERISK-18587)

Thanks for quick feedback to kpfleming and Tilghman
--Denna och nedanstående rader kommer inte med i loggmeddelandet--

M    CHANGES
M    configs/rtp.conf.sample
M    res/res_rtp_asterisk.c


git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/10@337178 65c4cc65-6c06-0410-ace0-fbb531ad65f3

CHANGES

@@ -223,6 +223,11 @@ IAX2 Changes
 * authdebug is now disabled by default. To enable this functionaility again
    set authdebug = yes in iax.conf.
 
+RTP Changes
+-----------
+ * The rtp.conf setting "strictrtp" is now enabled by default. In previous
+   releases it was disabled.
+
 ------------------------------------------------------------------------------
 --- Functionality changes from Asterisk 1.6.2 to Asterisk 1.8 ----------------
 ------------------------------------------------------------------------------

configs/rtp.conf.sample

@@ -23,5 +23,5 @@ rtpend=20000
 ;
 ; Enable strict RTP protection. This will drop RTP packets that
 ; do not come from the source of the RTP stream. This option is
-; disabled by default.
+; enabled by default.
 ; strictrtp=yes

res/res_rtp_asterisk.c

@@ -2829,7 +2829,7 @@ static int rtp_reload(int reload)
 	rtpstart = DEFAULT_RTP_START;
 	rtpend = DEFAULT_RTP_END;
 	dtmftimeout = DEFAULT_DTMF_TIMEOUT;
-	strictrtp = STRICT_RTP_OPEN;
+	strictrtp = STRICT_RTP_CLOSED;
 	if (cfg) {
 		if ((s = ast_variable_retrieve(cfg, "general", "rtpstart"))) {
 			rtpstart = atoi(s);