diff --git a/modules/rhizo_base/files/etc/freeswitch/autoload_configs/amr.conf.xml b/modules/rhizo_base/files/etc/freeswitch/autoload_configs/amr.conf.xml
index 232374f..7e3f069 100644
--- a/modules/rhizo_base/files/etc/freeswitch/autoload_configs/amr.conf.xml
+++ b/modules/rhizo_base/files/etc/freeswitch/autoload_configs/amr.conf.xml
@@ -1,11 +1,18 @@
 <configuration name="amr.conf" description="mod_amr configuration">
+
   <settings name="default">
     <!-- AMR mode set (see RFC 4867) -->
     <!-- param name="mode-set" value="0,1,2,3,4,5,6,7" /-->
-    <param name="mode-set" value="3" />
+    <param name="mode-set" value="4,5" />
+
     <!-- enable octet alignment -->
     <param name="octet-align" value="1"/>
+
+    <!-- rhizomatica custom param: force OA mode always for osmo-bts -->
+    <param name="force-oa" value="1"/>
+
     <!-- enable discontinuous transmission -->
-    <param name="dtx" value="true"/>
+    <param name="dtx" value="false"/>
+    <param name="default-bitrate" value="4"/>
   </settings>
 </configuration>