Hello
The decision of this problem

in default.xml

<------><action application="set" data="bridge_pre_execute_aleg_app=bind_meta_app"/>
<------><action application="set" data="bridge_pre_execute_aleg_data=1 ab s execute_extension::dxa XML features"/>
<------><action application="set" data="bridge_pre_execute_bleg_app=bind_meta_app"/>
<------><action application="set" data="bridge_pre_execute_bleg_data=1 ab s execute_extension::dxb XML features"/>


in features.xml

    <!-- In call Transfer for phones without a transfer button -->
    <extension name="dxa">
      <condition field="destination_number" expression="^dxa$">
<------><action application="answer"/>
<------><action application="set" data="who_make_transfer=${caller_id_number}"/>
<------><action application="read" data="11 11 'tone_stream://%(10000,0,350,440)' digits 5000 #"/>
<------><action application="execute_extension" data="is_transfer XML features"/>
      </condition>
    </extension>
....
    <extension name="dxb">
      <condition field="destination_number" expression="^dxb$">
        <action application="set" data="who_make_transfer=${destination_number}"/>
      <><action application="answer"/>
<------><action application="read" data="11 11 'tone_stream://%(10000,0,350,440)' digits 5000 #"/>
<------><action application="set" data="accountcode=${who_make_transfer}"/>
<------><action application="execute_extension" data="is_transfer XML features"/>
      </condition>
    </extension>



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