■ VBP Mobile Extension Solution Solution Description A salesperson or road warrior usually has more than one telephone numbers for contact, the office extension when he's in the office, number for his business trip location, and his mobile number. That too many contact numbers makes his manager, colleagues and customers confused, and himself hard to manage. The “One Number” service (where telephones of different PSTN numbers will ring simultaneously when called) offered by some service providers are developed to solve the problem; however, it cannot realize the interconnection between office extensions and mobile phones while reducing communication costs. Voipack’s VBP Mobile Extension solution is aimed to solve such problem. It associates office extension number, mobile phone number and home PSTN number together, when the salesperson or road warrior gets a call, the three telephones ring simultaneously, and he can pick up the call depending on where he is located. The dialing method remains unchanged, and no extra communication expenditure is incurred. Solution Topology The figure below depicts existing enterprise communication system layout. Persons who wish to contact the salesperson or road warrior, have to choose among a lot of telephone numbers (PSTN number, mobile phone number and office extension number), this is inconvenient, time consuming and incurs phone bills. With VBP Mobile Extension solution, the PBX system can be upgraded to a migrated VBP telephony system as shown in the topology below. In VBP Mobile Extension solution, Extension 101 in the PBX system connects with an FXO port of a Gateway, associate it with an FXS port to the VBP system, this way, Extension 101 can be reached by any extension in the PBX. In addition, the FXS port then is associated with the salesperson’s PSTN number and mobile phone number. The three telephones can be rung by turns, such as Round Robin or Fixed. When the salesperson is in the office, he can disable the One Number function, by doing so, only extension 101 in the office location will ring; When he is not in the office, he can enable the One Number function, and choose to receive calls from his pre-assigned PSTN telephone or mobile phone number, according to his arrangement. With this solution, the existing dialing plan will remain intact. No matter where the salesperson is, his colleagues in the office will only need to dial his current office extension, without any hassle. One extra note, if soft-phone is applied, people working in the office may communicate with the salesperson just by dialing 201(see diagram).