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-rw-r--r--UPGRADE.txt6
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diff --git a/UPGRADE.txt b/UPGRADE.txt
index 9a75748a8..f0e7246b7 100644
--- a/UPGRADE.txt
+++ b/UPGRADE.txt
@@ -303,6 +303,12 @@ The SIP channel:
option in sip.conf is removed to osp.conf as authpolicy. allowguest option
in sip.conf cannot be set as osp anymore.
+* The Asterisk RTP stack has been changed in regards to RFC2833 reception
+ and transmission. Packets will now be sent with proper duration instead of all
+ at once. If you are receiving calls from a pre-1.4 Asterisk installation you
+ will want to turn on the rfc2833compensate option. Without this option your
+ DTMF reception may act poorly.
+
* The $SIPUSERAGENT dialplan variable is deprecated and will be removed
in coming versions of Asterisk. Please use the dialplan function
SIPCHANINFO(useragent) instead.