Auerswald COMpact 4000 Operation Manual page 618

Settings
VoIP
Monitoring VoIP Status
STUN request
The STUN server's response is error-free and indicates that the firewall permits traffic via the
SIP transport protocol.
No STUN server has been entered for the VoIP provider in Public switched tel. networks >
Voice over IP (VoIP) > Provider > Configuration.
Error, e.g. because:
• The STUN server is offline.
• The STUN server's IP address or URL for the VoIP provider has been entered incorrectly
in Public switched tel. networks > Voice over IP (VoIP) > Provider > Configuration, or
a port specified by the provider has not been entered.
• The STUN server is sending incorrect responses.
• The STUN server reports that a firewall is blocking the SIP transport protocol or does not
otherwise permit Voice over IP. In this case, Voice over IP can presumably not be used
through the firewall without the proper access.
Registration
The REGISTER request sent to the VoIP provider was successful.
The STUN request failed or the system has been rebooted. The area must be rechecked to
display the current status. A grey dot (undetermined status) is displayed until a response is
received.
Error, e.g. because:
• The registrar is offline.
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COMpact 4000 - Firmware V6.6A - Installation, Operation and Configuration V03 03/2016