.Net CF 2.0 and gzip/deflate compression for web services

I've found out a part of a solution for this problem: I've overridden GetWebRequest() method of the web-client and implemented adding of 'Accept-Encoding' header, so now I can see 'Accept-Enconding: gzip, deflate' is sent to the server, but the answer is still not compressed.
Looks like the web-service needs to be configured in a way to support this.
I saw an advice to add the following section into web.config:

<pre lang="xml"><system.webServer>
<httpCompression directory="%SystemDrive%\inetpub\temp\IIS Temporary Compressed Files">
<scheme name="gzip" dll="%Windir%\system32\inetsrv\gzip.dll"/>
<dynamicTypes>
<add mimeType="text/*" enabled="true"/>
<add mimeType="text/xml" enabled="true"/>
<add mimeType="message/*" enabled="true"/>
<add mimeType="application/javascript" enabled="true"/>
<add mimeType="*/*" enabled="false"/>
</dynamicTypes>
<staticTypes>
<add mimeType="text/*" enabled="true"/>
<add mimeType="text/xml" enabled="true"/>
<add mimeType="message/*" enabled="true"/>
<add mimeType="application/javascript" enabled="true"/>
<add mimeType="*/*" enabled="false"/>
</staticTypes>
</httpCompression>
<urlCompression doStaticCompression="true" doDynamicCompression="true"/>
</system.webServer></pre>

but it didn't help me.

Can anybody say what it is necessary to do ?