WCF and Soap 1.1

I am trying to create a service that a 3rd party should hopefully consume.
The consumer is compatible with SOAP 1.1, which is why I am using basicHttpBinding for the server. When the actual request is made, something seems to go wrong with the content types expected by the server. Using basicHttpBinding I dont get why the server still expects 'application/soap+xml' which, to my knowledge, is only required by SOAP 1.2.

I've used wireshark to figure out exactly what those two were communicating about. See tcp stream and setup below.

Any help is appreciated.

3rd party app request

POST / HTTP/1.1

SOAPAction: http://tempuri.org/ITestService/Hello

Content-Type: text/xml; charset=utf-8

Host: shdesktop:8000

Content-Length: 297

Expect: 100-continue

Connection: Close

WCF Server response

HTTP/1.1 415 Cannot process the message because the content type 'text/xml; charset=utf-8' was not the expected type 'application/soap+xml; charset=utf-8'.

Content-Length: 0

Server: Microsoft-HTTPAPI/2.0

Date: Tue, 09 Feb 2010 14:03:19 GMT

Connection: close

Service configuration

<system.serviceModel>
    <services>
      <service behaviorConfiguration="behTestService" name="ConsoleApplication1.TestService">
        <endpoint address="" binding="mexHttpBinding" contract="IMetadataExchange" />
        <endpoint address="TestService" binding="basicHttpBinding"
            contract="ConsoleApplication1.ITestService" />
        <host>
          <baseAddresses>
            <add baseAddress="http://localhost:8000" />
          </baseAddresses>
        </host>
      </service>
    </services>
    <behaviors>
      <serviceBehaviors>
        <behavior name="behTestService">
          <serviceMetadata httpGetEnabled="true"/>
          <serviceDebug includeExceptionDetailInFaults="true" />
        </behavior>
      </serviceBehaviors>
    </behaviors>
  </system.serviceModel>