Altigen Alti-IP 600 Administration Manual page 49

Poor voice quality.
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• 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.
• 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.
Alti-IP 600 Administration Manual
Appendix A
37