Hi
Erm... well... it's lots of things. Typically it's a point of integration between two systems, that may or may not speak the same language.
So for example, since you've posted in the IP Telephony forum... a gateway round here is typically used to connect one IPT system to another; this connection might be a Cisco CallManager to the PSTN. In that scenario the gateway would tpyically be a Cisco router with software, interfaces, and DSPs that allows an IP call to be connected to a PSTN call on an E1.
It could also be a Cisco router connecting a CallManager to a SIP trunk; both legs would be IP and both could be SIP but you would have a gateway to manage the connection anyway (e.g. for security and compatibility).
Elsewhere it might be a server process - e.g. an MS Exchange mail system migth use an SMTP gateway to send mail through... this would be a relay for mail out to the wider world, again for security purposes typically.
Regards
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Aaron
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