Code Sample:

Dim sUrl,
Dim sAPI_ID, sPassword, sUsername, sMobileNo, sText
Dim oXMLHTTP, sPostData, sResult
sUrl = "http://api.aussiesms.com.au/?sendsms"
sPassword = "xxxx"
sMobileID = "xxxx"
sMobileNo = "xxxx"
sText = "This is an example message"
sPostData = sPostData & "&mobileID=" & sMobileID
sPostData = sPostData & "&password=" & sPassword
sPostData = sPostData & "&to=" & sMobileNo
sPostData = sPostData & "&text=" & sText
Set oXMLHTTP = Server.CreateObject("Microsoft.XMLHTTP")
oXMLHTTP.Open "POST", sUrl, false
oXMLHTTP.SetRequestHeader "Content-Type", "application/x-www-form-urlencoded"
oXMLHTTP.Send sPostData
sResult = oXMLHTTP.responseText
Set oXMLHTTP = nothing
Response.Write sResult