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Raver Salesforce SOA
For the Salesforce SOA announcement, http://weblog.infoworld.com/realworldsoa/archives/2007/05/salesforcecom_a.html, there is mention of calling out to internal Web Services. For the internal Web Services, do they need to be internet accesible, ie in a DMZ? I can imagine ways to bridge internal Web Services within an S-control but not on a trigger currently.
For them to be accessible from apex code, yes they need to be internet accessible.