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3Com was purchased by HP and has discontinued the NBX product line and support. They have also as of September 31, 2013 stopped selling licenses. Some resellers are still able to get them but I'm sure that will stop soon enough. The NBX tech support number I had was for tech support is now a prize hotline number.
NCP stands for Network Call Processor. There is a problem with communication. Since your server is running, reset your router (disconnect power, wait a few minutes, then reconnect) that supports your IP phone.
The problem would be more than just internet in order for the phones not to work. they just need to be plugged in to a switch on the network to be able to communicate with the phone system and the other phones. Probably a switch or the DSL router if it has a built in switch.
Assuming you are talking about remote phones, you need to program the NCP (call processor) IP into the phones manually or add option 187 to your DHCP scope. The phones are able to DHCP the just also need to know what the IP address of the phone system to connect to is. If the phones are on your local network then this is all unnecessary. They work at layer 2 locally and don't need to use an IP address or DHCP.
If the phones are only 6-8 months old you should be calling 3Com. those phones have a 1 year warranty and once you register them they will help you troubleshoot and replace them if needed. Can you provide more detail? Do you have any network issues while this is happening? Does speakerphone work but the handset doesn't?
3102 phones require group 2 licenses purchased from an authorized NBX reseller. if you don't have enough the system will not allow the phone to be discovered. You can check this unler the licenses tab while logged into the phone system as administrator.
The phone is in a continuous because it is trying to connect to the NBX. You need to make sure it is on the same network as the NBX. Also, within the NBX you need to make sure Auto-Discovery is enabled. You also need to check how many group 2 licenses you have, as this phone requires one to run on the NBX.