ok - so here is my request:
<?xml version="1.0" encoding="UTF-8"?>
<SOAP-ENV:Envelope
xmlns:SOAP-ENV="
http://schemas.xmlsoap.org/soap/envelope/"
xmlns:ns1="urn:agnitas-webservice"
xmlns:SOAP-ENC="
http://schemas.xmlsoap.org/soap/encoding/"
xmlns:xsi="
http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="
http://www.w3.org/2001/XMLSchema"
SOAP-ENV:encodingStyle="
http://schemas.xmlsoap.org/soap/encoding/">
<SOAP-ENV:Body>
<ns1:addSubscriber>
<in0 xsi:type="SOAP-ENC:string">account</in0>
<in1 xsi:type="SOAP-ENC:string">pw</in1>
<in2 xsi:type="xsd:boolean">true</in2>
<in3 xsi:type="SOAP-ENC:string">email</in3>
<in4 xsi:type="xsd:boolean">false</in4>
<in5 xsi:type="ns1:StringArrayType">
<x xsi:type="xsd:string">firstname</x>
<x xsi:type="xsd:string">lastname</x>
<x xsi:type="xsd:string">email</x>
<x xsi:type="xsd:string">udef_home_country</x>
<x xsi:type="xsd:string">udef_home_city</x>
<x xsi:type="xsd:string">
udef_home_newsletter_DAY_DATE
</x>
<x xsi:type="xsd:string">
udef_home_newsletter_MONTH_DATE
</x>
<x xsi:type="xsd:string">
udef_home_newsletter_YEAR_DATE
</x>
<x xsi:type="xsd:string">
udef_home_newsletter_HOUR_DATE
</x>
<x xsi:type="xsd:string">
udef_home_newsletter_MINUTE_DATE
</x>
<x xsi:type="xsd:string">
udef_home_newsletter_SECOND_DATE
</x>
<x xsi:type="xsd:string">udef_home_customer_DAY_DATE</x>
<x xsi:type="xsd:string">
udef_home_customer_MONTH_DATE
</x>
<x xsi:type="xsd:string">
udef_home_customer_YEAR_DATE
</x>
<x xsi:type="xsd:string">
udef_home_customer_HOUR_DATE
</x>
<x xsi:type="xsd:string">
udef_home_customer_MINUTE_DATE
</x>
<x xsi:type="xsd:string">
udef_home_customer_SECOND_DATE
</x>
<x xsi:type="xsd:string">udef_home_contact_type</x>
</in5>
<in6 xsi:type="ns1:StringArrayType">
<x xsi:type="xsd:string">Horst</x>
<x xsi:type="xsd:string">Klotz</x>
<x xsi:type="xsd:string">
test@aol.com</x>
<x xsi:type="xsd:string">DE</x>
<x xsi:type="xsd:string">Berlin</x>
<x xsi:type="xsd:string">14</x>
<x xsi:type="xsd:string">9</x>
<x xsi:type="xsd:string">2006</x>
<x xsi:type="xsd:string">0</x>
<x xsi:type="xsd:string">0</x>
<x xsi:type="xsd:string">0</x>
<x xsi:type="xsd:string">26</x>
<x xsi:type="xsd:string">7</x>
<x xsi:type="xsd:string">2007</x>
<x xsi:type="xsd:string">0</x>
<x xsi:type="xsd:string">0</x>
<x xsi:type="xsd:string">0</x>
<x xsi:type="xsd:string">C</x>
</in6>
</ns1:addSubscriber>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>