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The Evolution of Enterprise Calling Solution





                            PBX                                                                     PBX


                                                               PSTN
                                                              PSTN


                                                             PSTN

                            PBX                                                                     PBX
                                                           PSTN
                                                           PSTN
                                                                WAN


                                        Router/GW    VoIP  Toll Bypass           Router/GW





                                    Communications Manager                 Communications Manager

                                                              PSTN

                                                                   WAN
                                      Router/GW                                 Router/GW
                                                      IP Telephony
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