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.
Call Relay is a wise way of VoIP switched connection
amongst various IP networks. Call Relay makes sure that the organization of the
single central VoIP portal between IP networks, thus, makes sure that achieving
VoIP connections through the segments of IP networks will not be an issue.