We are wanting to get some Cisco IP Phones (namely the Cisco SPA525G2) at some of our workers homes, which would connect via VPN to our central office which has an ASA 5510.
Within our network we have asterisk setup, and some other brand softswitches and session border controllers. We have our own internal telephone network which we currently use with software sip phones.
My question is, are Cisco IP phones configurable / usable with SIP connections to asterisk and any other softswitches? Or do they only function exclusively with a CUCM or Cisco Voice device (which we dont have either of)?