XI to PCK communication via XI protocol

Hello,
I try to perform the following communication task: configure receiver on XI to communicate with
PCK via XI protocol.
In receiver configuration I have to input some properties and I don't know where to find them.
They are URL properties:
 1. Port (the first property "host" I know)
 2. Path prefix
I don't know where to find them on the <pckhost>.
May be it is something like http://<pckhost>:8000/sap/xi/engine?type=entry
because the same properties on <xihost> are
 1. Port 8000
 2. Path prefix "sap/xi/engine?type=entry"
Does anybody know how to configure this properties or
where to find them?
Thank you in advance.
Ivan.

Hello Stefan,
Thank you for your reply.
But I have already tried this URL before
and the service user already have had a role xi_af_receive in PCK.
But I have got the following exception:
td {font-family : Arial, Tahoma, Helvetica, sans-serif; font-size : 14px;} A:link A:visited A:active
400 Bad Request
SAP J2EE Engine/6.40
The request can't be parsed properly.
Details:
</body>
com.sap.engine.services.httpserver.exceptions.ParseException: Incorrect request line: . at com.sap.engine.services.httpserver.lib.impl.RequestLineImpl.init(RequestLineImpl.java:328) at com.sap.engine.services.httpserver.lib.impl.RequestLineImpl.parseRequestLine(RequestLineImpl.java:213) at com.sap.engine.services.httpserver.server.RequestAnalizer.initialize(RequestAnalizer.java:191) at com.sap.engine.services.httpserver.server.Client.initialize(Client.java:84) at com.sap.engine.services.httpserver.server.Processor.request(Processor.java:142) at com.sap.engine.core.service630.context.cluster.session.ApplicationSessionMessageListener.process(ApplicationSessionMessageListener.java:37) at com.sap.engine.core.cluster.impl6.session.UnorderedChannel$MessageRunner.run(UnorderedChannel.java:71) at com.sap.engine.core.thread.impl3.ActionObject.run(ActionObject.java:37) at java.security.AccessController.doPrivileged(Native Method) at com.sap.engine.core.thread.impl3.SingleThread.execute(SingleThread.java:94) at com.sap.engine.core.thread.impl3.SingleThread.run(SingleThread.java:162) </PRE></td></tr></table> </body> </html></SAP:AdditionalText>
<SAP:ApplicationFaultMessage namespace="" />
<SAP:Stack>HTTP response contains status code 400 with the description Bad Request XML element Envelope missing in SOAP message header (SAP XI Extension)</SAP:Stack>
<SAP:Retry>M</SAP:Retry>
</SAP:Error>
/code
Could you take a look at this?
Thanks a lot
Ivan

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