The main task of the VoIP implementation in the R&S®NC VoIP router is to connect telephone calls from different local interfaces (LAN, WLAN, ISDN) to the WAN connections that can be accessed by the router. This enables switching between the local interfaces (local call) and also the WAN interfaces.
The basis for the implementation and switching is the SIP protocol. The calls over all interfaces are converted into SIP by the interface translator (this mainly concerns the ISDN interfaces).
Furthermore, the bit-transparent connection is usually used for calls between multiple local ISDN interfaces to achieve the highest possible compatibility and quality.
