update CHANGES and UPGRADE.txt for early media behavior change between 1.6.1 and 1.6.2

(closes issue #16212)
Reported by: miki



git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@232657 65c4cc65-6c06-0410-ace0-fbb531ad65f3

CHANGES

@@ -354,6 +354,9 @@ Miscellaneous
 
 SIP Changes
 -----------
+ * The prematuremedia option is disabled by default.  Applications requiring
+   SIP early audio must use the Progress() dialplan application to generate
+   the 183 progress message.
  * Added support for SUBSCRIBE/NOTIFY with dialog-info based call pickups.
    Snom phones use this for call pickup of extensions that the phone is
    subscribed to.

UPGRADE.txt

@@ -63,6 +63,10 @@ From 1.6.2 to 1.8:
 
 From 1.6.1 to 1.6.2:
 
+* SIP no longer sends the 183 progress message for early media by
+  default.  Applications requiring early media should use the
+  progress() dialplan app to generate the progress message. 
+
 * The firmware for the IAXy has been removed from Asterisk.  It can be
   downloaded from http://downloads.digium.com/pub/iaxy/.  To have Asterisk
   install the firmware into its proper location, place the firmware in the