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ITSP 應用

With the Vigor2910V series router, people not only can make calls to/from other VoIP users across the Internet free of charge, but also can enjoy unlimited worldwide voice calls over Internet via ITSP (Internet Telephony Service Provider) gateway ( e.g. DrayTEL ). ITSP can transport telephone calls over the Internet, no matter whether traditional telephony devices, multimedia PCs or dedicated terminals take part in the calls, and no matter whether the calls are entirely or partially transmitted over the Internet. The useful application implements intercommunication among most popular ways of voice calls like VoIP, PSTN, GSM, etc.

Connect FXS to PSTN-PBX

As everybody knows, FXO interface of VoIP devices is suitable for connecting to the PSTN-PBX in order to expand the amounts of extensions. The Vigor VoIP routers with FXS interface also provide useful ways to implement the similar utilization. The following are two typical application scenarios.

Case1. Calls From VoIP to Extension

1) Alex dials the VoIP number of Vigor2910V (A).

2) After connection success, presses Sunny's extension 610.

Case2. Calls From Extension to VoIP

1) Sunny presses prefix number (e.g."7") firstly to choose exterior line - FXS of Vigor2910V (A).

2) Then dials Alex's VoIP number of Vigor2910V (B).

Note: PSTN-PBX is widely adopted by most Annex A countries. Because most Annex B countries such as Germany, Norway, the Netherlands have encouraged small offices to deploy ISDN PRI into PBX, PRI PBX are quite popular at offices located in Germany, the Netherlands, Norway.