so, what i want to do is a kind of night service on my uc520. that is, when a call comes in outside our office hours (on whatever extension, globally so to say), I just want a "Unfortunately, you've reached us outside  of normal business hours" messa...

so ... i bought two 7975s to replace two SPA525Gs on an UC520 (SCCP).so far i had no luck getting them to work. they hang at "obtaining IP address" (but that's just what the display says, in fact they successfully lease an IP) and their logs show doz...

ok ...when an SPA525G is operated in SIP mode, a lot of cool features such as downloading wallpapers from an TFTP server are available.(see https://www.myciscocommunity.com/docs/DOC-8495)when running the phone in SCCP mode, those features are missing...