Kenwood TS-890S Setting Manual page 72

72
To prevent the VoIP telephone functions from stopping, stop the functions of the BBR
connected to the front of the PC, and set the port required by KNS to open in the BBR built into
the modem.
Caution:
Change any settings such as open BBR ports at your own risk.
If you do not have confidence in the settings, we recommend you stop using the system.