sites 13 15 and 17 ip system 11 may in some embodiments be integrated with a cost network such as a pstn network or a private cost network cost equipment not shown in other embodiments ip system 11 may be a company hosted ip network such as a corporate wide area network wan linked to the internet there are many possible and variant architectures that may be implemented with respect to an ip network such as network 11 communications sites 13 15 and 17 may in one embodiment be communications centers in another embodiment such sites may be communication network hubs linking multiple communication centers or call in sites ip switches 19 21 and 23 are implemented one each at respective communication site 13 15 and 17 ip switch 19 within site 13 is linked to ip switch 21 within site 15 via a data network connection 27 ip switch 19 is also connected to ip switch 23 within site 17 via a data network connection 25 data network connections 27 and 25 are in this embodiment integrated service digital network isdn connections however other known types of connections may be used provided that at least one voice communication protocol of the family of network protocols known as transfer control protocol internet protocol tcp ip is observed one such protocol enabling.