diff --git a/conf/sip_profiles/nat.xml b/conf/sip_profiles/nat.xml
index 26e7734c01..9b9f721b69 100644
--- a/conf/sip_profiles/nat.xml
+++ b/conf/sip_profiles/nat.xml
@@ -12,7 +12,7 @@
     <param name="dialplan" value="XML"/>
     <param name="context" value="public"/>
     <param name="dtmf-duration" value="100"/>
-    <param name="codec-prefs" value="$${global_codec_prefs}"/>
+    <param name="codec-prefs" value="$${outbound_codec_prefs}"/>
     <param name="use-rtp-timer" value="true"/>
     <param name="hold-music" value="$${moh_uri}"/>
     <param name="rtp-timer-name" value="soft"/>
diff --git a/conf/sip_profiles/outbound.xml b/conf/sip_profiles/outbound.xml
index 5bcca2264c..8b0c033b85 100644
--- a/conf/sip_profiles/outbound.xml
+++ b/conf/sip_profiles/outbound.xml
@@ -17,7 +17,7 @@
     <param name="dialplan" value="XML"/>
     <param name="context" value="public"/>
     <param name="dtmf-duration" value="100"/>
-    <param name="codec-prefs" value="$${global_codec_prefs}"/>
+    <param name="codec-prefs" value="$${outbound_codec_prefs}"/>
     <param name="hold-music" value="$${moh_uri}"/>
     <param name="use-rtp-timer" value="true"/>
     <param name="rtp-timer-name" value="soft"/>
diff --git a/conf/vars.xml b/conf/vars.xml
index 3e7dade016..545a08ea6d 100644
--- a/conf/vars.xml
+++ b/conf/vars.xml
@@ -17,6 +17,7 @@
        used by: dingaling.conf.xml enum.conf.xml 
   --> 
   <X-PRE-PROCESS cmd="set" data="global_codec_prefs=G722,PCMU@20i,PCMA@20i"/>
+  <X-PRE-PROCESS cmd="set" data="outbound_codec_prefs=PCMU@20i,PCMA@20i"/>
   <X-PRE-PROCESS cmd="set" data="xmpp_client_profile=xmppc"/>
   <X-PRE-PROCESS cmd="set" data="xmpp_server_profile=xmpps"/>
   <!-- bind_server_ip