My 7942 IP phone is not registering in my UC500. when i connect it starts with a screen saying 'upgrading' and then it shows 'term42.default' upgrading and finally the screen becomes still with a black dot. I am not able to use any keys in the phone. even i am not able to factory reset the phone. the rest of the phones which i connect along with this is working fine. kindly help me in this issue.
Please check the firmware. Secondly please check whether the phone is supplied with cisco recommended power. Remove any other phone which is registered and working fine and connect your 7942 to its ethernet cable. I am not sure about this. But you can try doing all this steps. All the best.
If you factory reset your phone, it will need to have access to a TFTP server (that it locates via option 150 from the DHCP) to download it's image again. So make sure you have firmware 8.5(2) loaded on your TFTP as the default firmware. More recent firmware may be rejected by the phone as the signing keys have changed after that version. That load has both the old and the new keys so once you installed that you can go to any version you want.
If that is not working as well, grab a sniffer trace so you can see what the phone is requesting.
SIP traces provide key information in troubleshooting SIP Trunks, SIP
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clear text, these texts can be gibberish unless you understand fully
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