NuSOAP based service breaking .NET

[Steve Finkelstein]

I've created a NuSOAP based service that seems to work just fine when working on two disparate PHP systems as per the following:

r:htdocs sf$ cat soap.php
<?php

try {
        $client = new SoapClient("http://services.limelock.com/index.php?wsdl", array('trace' => true));
        $response =  $client->getCallDetailRecords(430);
} catch(Exception $e) {
       echo "RESPONSE: " . $client->__getLastResponse();
}

print_r($response);

r:htdocs sf$ php soap.php
Array
(
    [0] => stdClass Object
        (
            [extension] => 5364742
            [call_log] => Array
                (
                    [0] => stdClass Object
                        (
                            [date] => 2008-05-12 18:56:36
                            [caller] => 323
                        )

                    [1] => stdClass Object
                        (
                            [date] => 2008-05-13 11:25:51
                            [caller] => 718
                        )

                    [2] => stdClass Object
                        (
                            [date] => 2008-05-19 14:39:28
                            [caller] => 718
                        )

                    [3] => stdClass Object
                        (
                            [date] => 2008-05-19 19:13:05
                            [caller] => 718
                        )

                )

        )

    [1] => stdClass Object
        (
            [extension] => 6182612
            [call_log] => Array
                (
                    [0] => stdClass Object
                        (
                            [date] => 2008-05-12 18:09:03
                            [caller] => 718
                        )

                    [1] => stdClass Object
                        (
                            [date] => 2008-05-13 11:27:24
                            [caller] => 718
                        )

                )

        )

)
r:htdocs sf$

Yet, when the service gets invoked by a .NET client, they complain with the following:

{"The specified type was not recognized: name=':', namespace='', at
<return xmlns=''>."}

Any idea what might be the cause of this?

Thanks.