The SPA 500 series are only supported on UC500 platforms. If you wish to
use them with CUCM, you will have to use them as SIP phones.However, we don¹t support the use of the SPA500 phones with CUCM, even when integrating as third-party SIP devices and the the feature support is very limited. You can use the 6900 series phones instead 'cause they are fully supported on CUCM, and are priced rather closer to the SPA handsets than the rest of the phone portfolio.
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