Problem with big??? content and WSDL/XML

I try to create nuSoap client app, what uses wsdl 
(http://info.planet.ee/WSDL.xml). When I try to call function:
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
$params = array($DDoc, 'false');
# $DDoc - uploaded .ddoc file (utf-8) (Digitaly signed doc.)

$result = $client->call( 'StartSession', $params, '', '', FALSE, '', 'rpc', 
'literal' );
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
(Result: http://info.planet.ee/test.php.htm )

First of all, I cant send this request, it gives always HTTP Server error, 
because server gets only first part of this request. Is there some problem in 
PHP to send big files with SOAP??? (PEAR::SOAP has same problem in my computer)

When I try without file, I get error about invalid XML file! XML is correct but 
nuSoap doesnt include this 'StartSession' tag to XML, inserts only 
parameters?!?!! Why nuSoap ignores StartSession and all other commands in this 
wsdl file??? Something wrong with wsdl?? or some parameter is incorrect?
As you can see in request part of debugging info, there is no StartSession dag, 
but should be!!!

Thanx in advance, if anybody can help!

System info: PHP: 4.3.4/apache 2.0/Windows NT and PHP 4.3.3/apache 2/RH linux 
6.2

Muhv

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