Why SIP is "the next big thing"? compared to MGCP and Skinny.
well for starters SIP is IP based (and thus easy to integrate with existing internet services such as presence, voicemail, email and multimedia collaboration) and open standard, and is very easy to troubleshoot. SIP as it is based on IP, makes the requirement for expensive E1's/T1's and dedicated TDM equipment obsolete, by using SIP Trunks to providers, SIP trunks are also much easier to dimension.
SCCP, well it is cisco proprietary and thus almost per definition not supported by other vendors.
in terms of comparing H323 and MGCP read this:
http://www.cisco.com/en/US/tech/tk1077/technologies_tech_note09186a00806fedbe.shtml
My opinion of MGCP is, that unless you would want a more centralised point of administration/call processing; use it. This because if you combine CUCM with MGCP gateways most of your administration and call control lies with CUCM. the thing with that is, is that in case of fail over (be it to SRST or CME) you will still need to rely on H323 (or SIP) anyway, so I dont consider it less work to configure.
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