When you have the opportunity please review the document at the following link, it comprises of all the TCP/UDP ports as used within CUCM 6:-
http://www.cisco.com/en/US/docs/voice_ip_comm/cucm/port/6_0/60plrev1.pdf
SCCP uses TCP port 2000
MGCP uses UDP port 2427 (Gateway Control)
MGCP uses TCP port 2428 (Backhaul)
Hope this helps.
Regards
Allan.
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