Jjordon,
I do not believe the ports are different between sets. If you have the ports necessary to port forward 53XX phones it would be the same 86XX phones. The only times ports are different is System Model and Version Types never phone types.
Thanks,
TE
No, I don't believe that is correct... the 86xx series IP phones do not "talk" MiNet, they use ITP (Inter-Tel Protocol) and use different ports than the 53xx series phones which use MiNet. Even release 6 documentation shows different ports for "ITP" IP sets (meaning 86xx sets).
The proper ports for 86xx phones are:
VoIP: 6004-7039/UDP
ITP Protocol: 5566/TCP & 5567/UDP
The proper ports for 53xx phones are:
TFTP: 20001/UDP (fails over to 69/UDP if 20001 isn't available)
MiNet: 6800-6802/TCP
SAC: 3998/TCP & 3999/TCP
RTP: 50098-50508/UDP
Note that the system manual also recommends these additional ports for 53xx phones, but I have never done them and it works fine for me in most (all?) cases where only 53xx phones exist in the network:
RTP: 5004-5007/UDP (I think this is just for really old IP set compatibility)
RTP: 6004-6261/UDP (The older controller main processor port range for RTP)
RTP: 6604-7039/UDP (The older controller expansion processor port range for RTP)