If it is decided to remove and replace traditional telephony (PBX/ACD) with SIP Services - what are the options for Disaster Recovery? I mean, you can’t use the Switch (basic) Routing capabilities, because they have been removed… So; is there a SIP DR Solution, at all…?
That’s a very open and general question you’ve asked. It all comes down to what your media gateway supports. Are you thinking about complete SIP Server failure or just one (of a pair)?
If its complete failure I know some places have looked at Asterisk for ACD functionality. If it’s partial failure then get the gateway to point to an alternative SIP Server.