<wsa10:EndpointReference>
    <wsa10:Address>http://testIt/test.svc</wsa10:Address>
    <Identity xmlns="http://schemas.xmlsoap.org/ws/2006/02/addressingidentity">
        <KeyInfo xmlns="http://www.w3.org/2000/09/xmldsig#">
            <X509Data>
                <X509Certificate>
                    cert data
                </X509Certificate>
            </X509Data>
        </KeyInfo>
    </Identity>
</wsa10:EndpointReference>