Pease review Web Services Development Guide - page 136
How Integration Server Builds the Consumer Endpoint URL
Step 2 Override the host/port portion of the URL.
If a consumer Web service endpoint alias is assigned to the binder for the
invoked operation, the endpoint alias host and/or port information overrides
the host and/or port information in the URL resulting from Step 1. For more
information about how Integration Server uses the host and/or port
information to construct the endpoint URL, see “How the Consumer Web
Service Endpoint Alias Affects the Endpoint URL” on page 136
This should lead you to Integration Server Administration manual, chapter 12:
12. Configuring Endpoint Aliases for Web Services
In summary - you define endpoint Alias, and associate it the binder.
Shmuel Coller
webMethods Global Support EMEA
#Integration-Server-and-ESB#webMethods