Between some of the documentation being incorrect or misleading, the ports listed below are what I have found to work without any issues.

Alternative TFTP UDP:20001
Audio Stream Receive Ports UDP:6004-7039
Mitel Devices TCP:6800-6802
RTP/RTCP UDP:5004-5005
SAC Connection TCP:3998-3999,6880
Softphone GP UDP Port UDP:5567
Softphone TCP Call Control TCP:5566

A couple of 'gotchas'. Make sure the endpoint is configured for NAT and not Native. If you have a 5400 or 5600 which has the Processor Expansion Card, you will have to direct your 'Audio Stream Receive Ports' to that IP address.