The VoiceBlue is a GSM/UMTS gateway designed with the goal to reduce costs as much as possible. This is ensured by an automated saving solution able to route the call according to the time, pre-code or free minutes. The CallBack service is able to reduce roaming fees on trips abroad. If your company has other branch offices in several countries, you will greatly appreciate the possibility to call local mobile networks completely free of charge using VPN tariffs