It is a device capturing and controling all the signals, which are being created by the whole system, especially the made and received phone call signals. The device is mostly used for connecting regular phone system with the Internet and backwards.
The Digium D70 is a phone capable of providing HD quality of voice and PoE, it comes with six line keys and ten digital, rapid dial buttons providing status information in real time and additionally a field indicators of a busy lamp for one hundred of your most valuable contacts. The D70 is created for executives and administrators, it was built specially for Switchvox phone system ans Asterisk.