well, this solved my issue :=)
<extension name="DTMF" continue="true">
<condition field="${switch_r_sdp}" expression="a=rtpmap:(\d+)\stelephone-event/8000" break="never">
<action application="set" data="rtp_payload_number=$1"/>
<action application="log" data="INFO rfc2833 - on profile:[${sofia_profile_name}]"/>
<anti-action application="spandsp_start_dtmf"/>
<anti-action application="log" data="INFO InBand - on profile:[${sofia_profile_name}]"/>
</condition>
</extension>
not the best practice mode but for now, i can accept InBand DTMF
<extension name="Force_inBand_DTMF" continue="true">
<condition field="${sofia_profile_name}" expression="myPROFILENAME" break="never">
<action application="spandsp_start_dtmf"/>
<action application="log" data="INFO Forcing InBand DTMF on profile:[${sofia_profile_name}]"/>
</condition>
</extension>