SOURCE: 3com nbx 2102 issue - have had 2 phones i 1 week
3Com stopped making these phones 4 or 5 years ago. I would suggest contacting the merchant from whom yu purchased them for support.
SOURCE: When someone call 3Com NBX 3102 IP Phone we cannot hear
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?
SOURCE: Are NBX entry Phone Sip compatible?
The 2100 series and older aren't SIP compatible. The 3100 series are.
SOURCE: Roll back phone software
Add the NBX's IP and mac address to phone. Also static it on the same subnet.
It will go through about three long reboots.
If it doesn't work change the NBX to anything but "ethernet only" and reboot it. Then reboot phone with the above settings.
SOURCE: Cisco IP Phone 7940 and 3com nbx as 3rd party SIP phones
Find detailed configuration guide on how to setup Cisco UCM with Ozeki VoIP SIP SDK at: http://www.voip-sip-sdk.com/p_42-how-to-setup-ozeki-voip-sip-sdk-with-cisco-unified-communications-manager-voip.html or with 3CX at: http://www.voip-sip-sdk.com/p_124-voip-sip-sdk-3cx-voip.html
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