SIP FAQ : Relationship to Other Protocols : What is the relationship of a "softswitch" to SIP?
	The term "softswitch" is primarily a marketing term, with no well-defined technical meaning. It is often used to designate a collection of software providing telephony interworking services, including a signaling gateway (SG), media gateway controller (MGC) and a SIP user agent (UA). It can use any number of protocols, depending on the particular application and network configuration, including ISUP, CAS, MGCP, Megaco, H.323 and SIP. Many "softswitches" use SIP for communicating between softswitches.
	[Append to This Answer]
	hgs@cs.columbia.edu
	2000-Jul-20 12:06pm

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