res_fax: add FAXMODE variable

The app_fax set FAXMODE variable, but res_fax missing this feature.
This patch add FAXMODE variable which is set to either "audio" or "T38".

ASTERISK-25980

Change-Id: Ie3dcbfb72cc681e9e267a60202f7fb8723a51b6b

1 files changed, 5 insertions, 0 deletions

diff --git a/CHANGES b/CHANGES
index 8d527d11f..fb8e681e2 100644
--- a/CHANGES
+++ b/CHANGES
@@ -12,6 +12,11 @@
 --- Functionality changes from Asterisk 13.9.0 to Asterisk 13.10.0 -----------
 ------------------------------------------------------------------------------
 
+res_fax
+------------------
+ * Added FAXMODE variable to let dialplan know what fax transport was used.
+   FAXMODE variable is set to either "audio" or "T38".
+
 res_pjsip
 ------------------
  * Added "reg_server" to contacts.