These low cost SPA phones were built for dual operation on a single image (A tokenized version of SKinny, and SIP) for UC5xx and managed (hosted call control SPs).
They also don't support point to point video telephony or octal lines.
They will not positioned with ISR based CUCME or BE or higher, won't support pure SCCP and will be supported to the extent of any other third party SIP phone.
You may want to call the TAC and ask them what they do in cases involving them to be sure you have that piece clear.
