Ports required for voice gateway registration

Hi,
Currently our remote office voice gateway is trying to register to the CM and in between there is a firewall. We have opened port DNS, NTP, 2427 and 2428 but it still showing registering to the call manager. What other ports shall we open to make it works?
What about the port requirement for CUE?
Thanks.

For MGCP:
DNS
NTP
UDP 2427
TCP 2428
TFTP (UDP 69)
For CUE, here is a link you may find helpful:
http://www.cisco.com/en/US/partner/netsol/ns340/ns394/ns165/ns391/networking_solutions_design_guidance09186a00801f8e31.html#wp41149
hth,
nick

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