diff --git a/bbb-voice-conference/config/freeswitch/conf/vars.xml b/bbb-voice-conference/config/freeswitch/conf/vars.xml
index 565abc257773620f2b765cd0557a1317eed31731..95eb9a051560c51260163307da8c6b81a245c889 100644
--- a/bbb-voice-conference/config/freeswitch/conf/vars.xml
+++ b/bbb-voice-conference/config/freeswitch/conf/vars.xml
@@ -124,7 +124,7 @@
 
   -->
   <X-PRE-PROCESS cmd="set" data="global_codec_prefs=speex@16000h@20i,speex@8000h@20i,G7221@32000h,G7221@16000h,G722,PCMU,PCMA,GSM"/>
-  <X-PRE-PROCESS cmd="set" data="outbound_codec_prefs=PCMU,PCMA,GSM"/>
+  <X-PRE-PROCESS cmd="set" data="outbound_codec_prefs=speex@16000h@20i,PCMU,PCMA,GSM"/>
 
   <!--
       xmpp_client_profile and xmpp_server_profile