■ VBP VoIP Call Termination Solution With rapid economic growth and global business expansion, enterprises have to pay for mounting toll call expenses. Making long distance toll calls by IP telephony system is by far the best choice at this stage. The dialing process of prepay IP card is inconvenient and the call rate of IP telephony is not as cheap as expected, thus the corporate offices are reluctant to adopt the IP telephony system. VBP VoIP solution solves such problems. This solution enables the enterprise to access virtual service provider's telephony system, so that the enterprise users can make toll calls at very low call rate without changing its existing dialing plan. Following is a diagram for legacy enterprise communication system. In legacy PBX system, PBX extensions are connected to PSTN via PBX devices. Only calls between extensions within a PBX are free of charge. Calls from extensions to PSTN telephones or mobiles are made via PBX devices, and which the phone rate is usually very high. In legacy PBX system, users dial “0” plus external telephone number to make calls to PSTN numbers or mobile numbers. The call rates are listed below: Local rate (for local PSTN number or mobile number) First 3 minutes: ￥0.2/minAfterwards::￥0.11/m Long Distance rate (for foreign PSTN number or mobile number) ￥0.07/10s IP telephony rate ￥0.15-￥0.3/m + local call rate, plus initial call fee￥0.2 The topology for VBP VoIP Call Termination Solution is as follows: In this solution, the VoIP gateway connects PBX devices with the ITSP (Internet Telephony Service Provider). The PBX connected to the FXO port of the gateway with FXS port of the VoIP gateway, and the VoIP gateway then connects to ITSP's service platform. Set the FXO port number of PBX as 9, thus the extension user may access ITSP platform when he dials “9”, however, the extension user still may call PSTN number by dialing “0” first.The call rates of such VBP VoIP solution are priced at $0.05/m within USA (except calls to Alaska) VoIP solution for VBP enormously saves communication expenditure and reduces operation costs. Note: Voipack Corporation offers legal telecommunication invoices.