UC500 support almost all stuff that UCME does but its small and its a very license based. CME or UC500 don't support SIP Phones, just CUCM.

Supports SRST and PSTN (of course), and it has a wizard. The bad thing is that UC500 IOS is not router oriented, if you are going to use it more than static routes you just can't, it's a pity

Kind regards