SIP and H.323/MGCP/Megaco

A comparison between the protocols to sum up the information in this section.

		SIP		H.323		MGCP/Megaco
Philosophy		Horizontal		Vertical		Vertical
Complexity		Low		High		High
Scope		Simple		Full		Partial
Scalability		Good		Poor		Moderate
New Service Revenues		Yes		No		No
Internet Fit		Yes		No		No
SS7 Compatibility		Poor		Poor		Good
Cost		Low		High		Moderate