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-rw-r--r--include/asterisk/frame.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/asterisk/frame.h b/include/asterisk/frame.h
index 0adabc241..8d376b4be 100644
--- a/include/asterisk/frame.h
+++ b/include/asterisk/frame.h
@@ -93,6 +93,7 @@ struct ast_codec_pref {
*
* \note It is important that the values of each frame type are never changed,
* because it will break backwards compatability with older versions.
+ * This is because these constants are transmitted directly over IAX2.
*/
enum ast_frame_type {
/*! DTMF end event, subclass is the digit */