MGCP :  Uses clear text for call controlUses a client-server modelIdeally positioned for service providers (centrally located call agents)Centralized management and control (Dial PLAN, etc.)Enhanced call survivabilityBetter feature interaction with capabilities LIKE Caller-IDSupport of QSIG supplementary services with CCM.

H.323 : Uses Abstract SYNTAX Notation 1 for call control messagesUses a peer-to-peer modelScales WELL in an enterpriseFractional PRI supportCaller-ID support on analog FXOMany more TDM interface types and signallingGateway-resident applications like TCL and VXMLCAC network design with H.323 GatekeepersNo release dependencies between GWs and CCMCall preservation for SRST on PRIsNFAS support

MGCP :  Uses clear text for call controlUses a client-server modelIdeally positioned for service providers (centrally located call agents)Centralized management and control (Dial plan, etc.)Enhanced call survivabilityBetter feature interaction with capabilities like Caller-IDSupport of QSIG supplementary services with CCM.

H.323 : Uses Abstract Syntax Notation 1 for call control messagesUses a peer-to-peer modelScales well in an enterpriseFractional PRI supportCaller-ID support on analog FXOMany more TDM interface types and signallingGateway-resident applications like TCL and VXMLCAC network design with H.323 GatekeepersNo release dependencies between GWs and CCMCall preservation for SRST on PRIsNFAS support