D-Link DVC-1000 - Manual (Page 51)

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Troubleshooting (continued)
11. No audio in call.
Audio cables are not plugged in correctly. Ensure that your audio
cables are correctly plugged into the TV. Make sure that the TV is set for
video input. Check the volume level on the TV. Consult your TV manual
for reference.
Telephone is not setup properly. Plug the telephone into the back of
the VideoPhone. If the telephone is powered (cordless) make sure that it
is plugged into a power supply. Consult your telephone user manual for
reference.
Port forward the appropriate ports to the VideoPhone. The
VideoPhone needs ports 1720 (TCP) and ports 15328-15333 (TCP and
UDP) open to function properly. See the section Using the DVC-1000
with Routers, Gateways or Broadband Modems on page 43, or consult
your router’s documentation or your network administrator for help on
doing this.
VideoPhone is not functioning properly behind NAT. Go to the
Settings>Network>Public IP screen. Select “Auto detect public IP
address.” If the VideoPhone is unable to detect the public IP address, it
should be entered manually using “Fixed IP.” The public IP address is
given to you by either your ISP or your network administrator.
Incorrect network speeds. See the Incorrect Network Speeds
section in this Troubleshooting Guide
Volume is adjusted incorrectly. You can adjust the volume on the TV
as you would when watching a television show. You might also be able
to adjust the volume on your telephone. Consult your TV and/or telephone
user guide for support.
12. Audio stops during a call.
Other party muted their audio. If the other party mutes their audio
you will not be able to hear him or her.
Network is congested. Give the VideoPhone a couple of minutes to try
to recover, or disconnect the call and try again at a later time.