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The NetModule Router Series NB2000 and NB3000 support voice and audio communication with two extension:
VoiceGSM-Voice to VoIP/SIP to make or receive voice call over the mobile network.
Audioline-in/out to VoIP/SIP to connect audio signals directly to the device. Typical microphone and loudspeaker via external amplifier.
Basic concept
An endpoint is a SIP/VoIP device like
To establish a call two steps are needed:
Signalling = establish a call
Call-Routing = making the connection
Simple behaviour can be configured by the Web-GUI.
For more complex applications the SDK can be used.
Voice gateway configuration via Web GUI
Administration
Endpoints
Endpoint types
Routing
Routing modes