freeswitch/conf/rayo/directory/default/userc.xml

<include>
  <user id="userc">
    <!-- Outbound Registrations Related to this user -->
    <gateways>
    </gateways>
    <params>
      <!-- omit password for authless registration -->
      <param name="password" value="1"/>
    </params>
    <variables>
      <!--all variables here will be set on all inbound calls that originate from this user -->
      <variable name="user_context" value="public"/>
      <variable name="effective_caller_id_name" value="User C"/>
      <variable name="effective_caller_id_number" value="8006492568"/>
    </variables>

    <vcard>
      <!-- insert optional compliant vcard xml here-->
    </vcard>
  </user>
</include>