URL in defining web service!!

I am using SOAP-XI-RFC scenario.

I want to confirm that Whether I am connecting with the same CRM system, where I am putting some test data or not?

For that, I want to know what is this URL, which i fill in when I 'Define the web service' in Configuraiton?

"http://host:port/XISOAPAdapter/MessageServlet?channel=:service:channel"

I understand this 'channel=:service:channel' part,

but what should host, port, XISOAPAdapter, MessageServlet in 'http://host:port/XISOAPAdapter/MessageServlet' ??

N.B.: I use the proposed URL. "http://iccxi.sap.com:50080/sap/xi/engine?type=entry&version=3.0"

Thanks,

Narendra.