Add codec examples in sip.conf

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@1384 65c4cc65-6c06-0410-ace0-fbb531ad65f3

configs/sip.conf.sample

@@ -13,6 +13,9 @@ context = default		; Default for incoming calls
 ;defaultexpirey=120		; Default length of incoming/outoing registration
 ;notifymimetype=text/plain	; Allow overriding of mime type in NOTIFY
 ;videosupport=yes		; Turn on support for SIP video
+;disallow=all			; Disallow all codecs
+;allow=ulaw			; Allow codecs in order of preference
+;allow=ilbc
 ;
 ;register => 1234@mysipprovider.com	; Register with a SIP provider
 ;register => 2345@mysipprovider.com/1234 ; Register 2345 at sip provider as 1234 here.