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Troubleshooting
42 Alti-IP 600H Manual
One way connection. • Make sure firewall setting has all the TCP/UDP
ports required by AltiWare opened.
• If NAT is used, make sure NAT is enabled and NAT
address is set up correctly.
Phone does not show
anything on LCD display.
Check the power source to be sure the Alti-IP 600H
phone is receiving power.
Poor voice quality.
• Make sure a switch is used, rather than a hub, in the
corporate LAN.
• G.711 provides better voice quality.
• If VoIP is set up over WAN, set priority queuing on
the WAN router.
• Make sure WAN QoS is okay by pinging a few
hundred packets from remote site and observe
packet loss and network latency.
• Adjust jitter buffer to accommodate network
latency.
Register failed.
• Check to make sure the extension number and
extension password is set up properly and that the IP
extension is enabled.
• Check to make sure the IP Phone Services is started
in AltiWare.
• If IP Phone is associated with a physical phone (with
the same extension number), use #27 to activate the
IP Phone to normal operating mode.