Chapter 22 VoIP
EX5501-B0 / AX7501-B0 / PX7501-B0 User’s Guide
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1
Pick up the phone and press “****” on your phone’s keypad and wait for the message that says you are
in the configuration menu.
2
Press a number from 1101~1105 on your phone followed by the “#” key.
3
Play your desired music or voice recording into the receiver’s mouthpiece. Press the “#” key.
4
You can continue to add, listen to, or delete tones, or you can hang up the receiver when you are
done.
Listening to Custom Tones
Do the following to listen to a custom tone:
1
Pick up the phone and press “****” on your phone’s keypad and wait for the message that says you are
in the configuration menu.
2
Press a number from 1201~1208 followed by the “#” key to listen to the tone.
3
You can continue to add, listen to, or delete tones, or you can hang up the receiver when you are
done.
Deleting Custom Tones
Do the following to delete a custom tone:
1
Pick up the phone and press “****” on your phone’s keypad and wait for the message that says you are
in the configuration menu.
2
Press a number from 1301~1308 followed by the “#” key to delete the tone of your choice. Press 14
followed by the “#” key if you wish to clear all your custom tones.
You can continue to add, listen to, or delete tones, or you can hang up the receiver when you are
done.
22.9.1 Quality of Service (QoS)
Quality of Service (QoS) refers to both a network's ability to deliver data with minimum delay, and the
networking methods used to provide bandwidth for real-time multimedia applications.
Type of Service (ToS)
Network traffic can be classified by setting the ToS (Type of Service) values at the data source (for
example, at the Zyxel Device) so a server can decide the best method of delivery, that is the least cost,
fastest route and so on.
DiffServ
DiffServ is a class of service (CoS) model that marks packets so that they receive specific per-hop
treatment at DiffServ-compliant network devices along the route based on the application types and
traffic flow. Packets are marked with DiffServ Code Points (DSCP) indicating the level of service desired.
