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2-24 Administrator’s Handbook
bandwidths from 20 kbps to 90 kbps, depending on the CODEC setting – compared to the total throughput bandwidth of the Gateway and the network. There will usually be fewer than two or three packets pending in the Gateway in any queue in the Gateway during the conversation. If, during the call, however, a user is surfing and decides to download, or upload, a file through the Gateway, it is possible that during the file transfer the voice quality of the VoIP call could be degraded. A higher setting for the
On the other hand, if 10 or 20 VoIP calls are simultaneously being handled by the Gateway, for example, in an office setting, then
The
You can then define custom Rules. If your applications do not provide Quality of Service (QoS) control, rules allow you to define streams for some protocols, port ranges, and between specific end point addresses.
•To define a Rule, select Add Rules and press Return.
(Once you have added one or more rules, you can edit any of them by returning to this screen and selecting
Show/Change Rules.)
The Diffserv Rule screen appears.
| Diffserv Rule |
Name: |
|
Protocol... | TCP |
Priority... | off |
Direction... | outbound |
Start Port: | 0 |
End Port: | 0 |
Inside Ip Address: | 0.0.0.0 |
Inside Ip Netmask: | 0.0.0.0 |
Outside Ip Address: | 0.0.0.0 |
Outside Ip Netmask: | 0.0.0.0 |
COMMIT | CANCEL |
Return accepts * ESC cancels * Left/Right moves insertion point * Del deletes.
•Name – Enter a name in this field to label the rule.
•Protocol – Select the protocol from the