hi,
in mod_lua for Serving_Configuration ( http://wiki.freeswitch.org/wiki/Mod_lua/Serving_Configuration ) i have defined the settings as follows:
1-

 <configuration name="lua.conf" description="LUA Configuration">
  <settings>

       <param name="xml-handler-script" value="dp.lua"/>
    <param name="xml-handler-bindings" value="directory"/>
       
  </settings>
</configuration>

2- /usr/local/freeswitch/scripts/dp.lua
freeswitch.consoleLog("INFO", "SECTION    " .. XML_REQUEST["section"] .. "\n")
freeswitch.consoleLog("INFO", "TAG_NAME   " .. XML_REQUEST["tag_name"] .. "\n")
freeswitch.consoleLog("INFO", "KEY_NAME   " .. XML_REQUEST["key_name"] .. "\n")
freeswitch.consoleLog("INFO", "KEY_VALUE  " .. XML_REQUEST["key_value"] .. "\n")

freeswitch.consoleLog("INFO",params:serialize())
io.write("TEST \n" .. params:serialize("xml") .. "\n");
--io.write("SIP_AUTH_METHOD\n" .. params:getHeader("sip_auth_method") .. "\n");
--io.write("sip_profile\n" .. params:getHeader("sip_profile") .. "\n");
local sipprofile = params:getHeader("sip_profile");
print ("sip profile is:" .. sipprofile);

3- the output of the above lua file is :



TEST
<event>
  <headers>
    <Event-Name>REQUEST_PARAMS</Event-Name>
    <Core-UUID>1d640ebe-be01-11e1-b2cd-4109894802cc</Core-UUID>
    <FreeSWITCH-Hostname>PBX</FreeSWITCH-Hostname>
    <FreeSWITCH-Switchname>PBX</FreeSWITCH-Switchname>
    <FreeSWITCH-IPv4>192.168.10.89</FreeSWITCH-IPv4>
    <FreeSWITCH-IPv6>%3A%3A1</FreeSWITCH-IPv6>
    <Event-Date-Local>2012-06-24%2018%3A13%3A48</Event-Date-Local>
    <Event-Date-GMT>Sun,%2024%20Jun%202012%2013%3A43%3A48%20GMT</Event-Date-GMT>
    <Event-Date-Timestamp>1340545428075826</Event-Date-Timestamp>
    <Event-Calling-File>sofia_reg.c</Event-Calling-File>
    <Event-Calling-Function>sofia_reg_parse_auth</Event-Calling-Function>
    <Event-Calling-Line-Number>2364</Event-Calling-Line-Number>
    <Event-Sequence>1240</Event-Sequence>
    <action>sip_auth</action>
    <sip_profile>internal</sip_profile>
    <sip_user_agent>eyeBeam%20release%201102q%20stamp%2051814</sip_user_agent>
    <sip_auth_username>1000</sip_auth_username>
    <sip_auth_realm>192.168.10.89</sip_auth_realm>
    <sip_auth_nonce>5fef3276-be02-11e1-b2fd-4109894802cc</sip_auth_nonce>
    <sip_auth_uri>sip%3A192.168.10.89</sip_auth_uri>
    <sip_contact_user>1000</sip_contact_user>
    <sip_contact_host>192.168.18.120</sip_contact_host>
    <sip_to_user>1000</sip_to_user>
    <sip_to_host>192.168.10.89</sip_to_host>
    <sip_from_user>1000</sip_from_user>
    <sip_from_host>192.168.10.89</sip_from_host>
    <sip_request_host>192.168.10.89</sip_request_host>
    <sip_auth_qop>auth</sip_auth_qop>
    <sip_auth_cnonce>8725f832cb29a466ba073ef5d63de959</sip_auth_cnonce>
    <sip_auth_nc>00000010</sip_auth_nc>
    <sip_auth_response>ee0155cd5b41536e56898ff585502e75</sip_auth_response>
    <sip_auth_method>REGISTER</sip_auth_method>
    <key>id</key>
    <user>1000</user>
    <domain>192.168.10.89</domain>
    <ip>192.168.18.120</ip>
  </headers>
</event>

sip profile is :internal
---------------------------------------------------

Now i am going to check  using reltime every user that registers on sip phone -like 3CXphone - instead of in-memory method (flat file on freeswitch), now 
what is the next step for implementing? 
Now  need to define mysql and insert query  in lua script and compare the query with the value of params:getHeader ?
the resource for mod_lua serving configuration is a bit

plz help, 
thanks so much