freeswitch/conf/sbc/autoload_configs/translate.conf.xml

<include>
  <configuration name="translate.conf" description="Number Translation Rules">
    <profiles>
      <profile name="US">
	<rule regex="^\+(\d+)$" replace="$1"/>
	<rule regex="^(1[2-9]\d{2}[2-9]\d{6})$" replace="$1"/>
	<rule regex="^([2-9]\d{2}[2-9]\d{6})$" replace="1$1"/>
	<rule regex="^([2-9]\d{6})$" replace="1${areacode}$1"/>
	<rule regex="^011(\d+)$" replace="$1"/>
      </profile>
      <profile name="GB">
	<rule regex="^\+(\d+)$" replace="$1"/>
	<rule regex="^$" replace="$1"/>
      </profile>
      <profile name="HK">
	<rule regex="\+(\d+)$" replace="$1"/>
	<rule regex="^(852\d{8})$" replace="$1"/>
	<rule regex="^(\d{8})$" replace="852$1"/>
      </profile>
    </profiles>
    <!--
      <profile name="">
	<rule regex="^\+(\d+)$" replace="$1"/>
	<rule regex="^$" replace="$1"/>
      </profile>
    -->
  </configuration>
</include>