I have a 7940 IP Phone behind a 831 Router. This phone obtains DHCP from a centralized server just fine. It then obtains, via TFTP, it's config file, but it will not register with the primary Subscriber CM. It will only register with the secondary Publisher CM.
The phone is on a private 10.x.x.x network, the CallManagers are on a 129.9.x.x network.
If I change the config on the 831 router and place the phone on it's own 129.9.x.x subnet behind the router, it works just fine.
The problem only occurs if all three are true:
1) The phone is on a non 129.9.x.x network
2) The phone is sending TCP packets (UDP works fine)
3) The phone is behind a 831 router
If any of those are not true, the phone registers just fine.
Please note that when the phone does not register, it keeps "retransmitting" the packet. SYN.. SYN.. SYN.. the CallManager keeps sending back ACK's but the phone never sees them.
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