Re-instate removed comment

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@18785 65c4cc65-6c06-0410-ace0-fbb531ad65f3

channels/chan_sip.c

@@ -1027,6 +1027,7 @@ static struct ast_rtp_protocol sip_rtp = {
  * matches the sip method 'id'.
  * Strictly speaking, SIP methods are case SENSITIVE, but we do
  * a case-insensitive comparison to be more tolerant.
+ * following Jon Postel's rule: Be gentle in what you accept, strict with what you send 
  */
 static int method_match(enum sipmethod id, const char *name)
 {