Hi Pubfpnd, the WsHttpBinding includes all of the latest web services specifications, so to interoperate with it you'll need a pretty recent Web service stack on the other end of the wire, like WCF or one of the recent products from Apache, IBM, Oracle, or a few others. The .NET stacks that proceeded WCF, like ASMX and WSE, don't support the newest specs, so you'll need to use the BasicHttpBinding with them.
Cheers,
JJustice [MSFT]
[1] The binding supports the recent specifications for reliability (WS-ReliableMessaging), security (WS-SecureConversation, WS-Trust, WS-Security 1.1), distributed transactions (WS-AtomicTransactions, WS-Coordination), addressing (WS-Addressing), and attachments (MTOM & XOP).