Quality of Service (QoS)
is a feature of routers and switches which prioritizes traffic so that more
important traffic can pass first. The result is a performance improvement for
critical network traffic. QoS equipment is useful with VoIP phones or in LANs
with high volumes of local traffic.
SETTING UP QOS
The QoS settings can be found under Applications &
Gaming -> QoS.
There are many ways to assign priority to your VOIP
system. I just used the IP address as shown below. 192.168.1.10 is
the LAN private IP of the Asterisk system.
With the priority of the Asterisk box set to high, we should
be all set. It turns out that unless you cap the bandwidth, you will
still have QoS problems. Enter around 85% of your up and down bandwidth
in the Uplink and Downlink boxes. Capping the bandwidth is required to
keep the latency low. Otherwise, your bandwidth is filled up with large
packets and the priority settings are not effective for VOIP traffic. See http://www.dd-wrt.com/wiki/index.php/Quality_of_Service for
more information.
With the above settings, VOIP calls are now clear even with
other concurrent activities.
UPDATE:
Several people have reported being able to install dd-wrt on
v6 WRT54 routers and the QoS configuration is the same.
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