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An HTTP gateway allows you to use a remote SMS service to send SMS messages, as opposed to having a GSM modem connected locally to your server. This remote service might be provided by your GSM carrier, a third-party SMS service provider, or even another instance of IceWarp SMS Server.
This could be useful in a large distributed organization where you could have a single IceWarp Server set up to deal with all SMS requests, or even multiple services around the world to take advantage of cheaper national SMS pricing plans - using rules (see Outgoing Messages) to decide which provider to use.