Upon receiving the incoming messages XML document, the customer
should reply with a confirmation of the reception.
The DTD for the response is as follows:
<!-- PSWinCom DTD SMS Receive Response-->
<!ELEMENT ID (#PCDATA)>
<!ELEMENT STATUS (#PCDATA)>
<!ELEMENT MSG (ID, STATUS)>
<!ELEMENT MSGLST (MSG+)>
A sample confirmation of the above receive request will be as follows:
<?xml version="1.0"?>
<MSGLST>
<MSG>
<ID>1</ID>
<STATUS>OK</STATUS>
</MSG>
</MSGLST>