connecting it to a UC520. Have a 7960 connected to the UC520 on the same network that gets DHCP and makes phone calls. It is running 7.2.5 and using SIP. Is there way to do a hard reset on the phone like holding down the pound key on a 7900 series phone?
I don't believe there is a reset similar to the 7960. Can you try changing the mode to SPCP? What version of IOS are you running? Can you post your config as well, be sure to remove passwords from the config.
Do you have a power brick that works on the SPA525 or a POE switch that isn't plugged in to anything? I would like to make sure that the SPA isn't trying to upgrade or having other issues and rebooting because of something on the network.
Can you post your IOS image and the config as well?
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