[SOAP] How to get the __soapCall response without input parameters

The function "getInf" does not have input parameters and I'd like to get the
response data.

$response = $this->__soapCall('getInf',array());

This statement occurs error;
 "Function ("getInf") is not a valid method for this service"

I got the same error though I tried to specify varios arraies (ex. array($a,
$b, ..)).
Please tell me how to get the response.

The response message I like to get as follows;

				:
				:
<result     xmlns:n1="java:com.abc.bpr.test.datamodel"
     soapenc:arrayType="n1:W_Ws_Content_Info[24]">
    <W_Ws_Content_Info      xsi:type="n1:W_Ws_Content_Info">
     <xx_content_id       xsi:type="xsd:string">1</xx_content_id>
     <xx_content_name       xsi:type="xsd:string">aa</xx_content_name>
     <xx_system_name       xsi:type="xsd:string">aaaaa</xx_system_name>
     <xx_system_brief_name      
xsi:type="xsd:string">aa</xx_system_brief_name
     <xx_common_name       xsi:type="xsd:string">cn=23 aa Policy
Group,ou=groups,dc=xxxx,dc=jp</xx_common_name>
     <xx_member_url      
xsi:type="xsd:string">https://xxxxx.jp/aa/</xx_member_url>
     <xx_system_label       xsi:type="xsd:string">aaaaaaa</xx_system_label>
    </W_Ws_Content_Info>
    <W_Ws_Content_Info      xsi:type="n1:W_Ws_Content_Info">
     <xx_content_id       xsi:type="xsd:string">2</xx_content_id>
     <xx_content_name       xsi:type="xsd:string">bb</xx_content_name>
     <xx_system_name       xsi:type="xsd:string">bbbbb</xx_system_name>
     <xx_system_brief_name      
xsi:type="xsd:string">bb</xx_system_brief_name
     <xx_common_name       xsi:type="xsd:string">cn=24 bb Policy
Group,ou=groups,dc=xxxx,dc=jp</xx_common_name>
     <xx_member_url      
xsi:type="xsd:string">https://xxxxxx.com/bb/</xx_member_url>
     <xx_system_label       xsi:type="xsd:string">bbbbbbb</xx_system_label>
    </W_Ws_Content_Info>
				:
				:
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