User manual

- BaseWall VPN 6000 user manual -
10 Wizard: Shaping/VoIP
10.1 Shaping
The VPN 6000 can divide the Internet traffic in separate parts. For Voice over IP
it is necessary to separate the different computers that use VoIP from the rest
of the traffic. It is then possible to reserve some traffic for these computers so
that other traffic for example big download cannot block the small but steady
stream of voice packages.
When reserved bandwidth isn't completely used the rest becomes available for
the other traffic.
10.2 Bandwidth
Most ISP use a simple mechanism to limit the bandwidth use of their
customers. When the upload or download stream reaches a limit the total
traffic is blocked. So a big download often blocks the sending of packages. It
now becomes vital for the shaping to know the limits set by the ISP so it will
always limit traffic before the ISP blocks everything. On entering the
Shaping/VoIP wizard it checks the shaping statistics on the Internet devices.
When there is no bandwidth information known it will ask for it before the VoIP
computers can be identified.
10.3 Hosts
The different IP addresses of the computers with VoIP should be known. All
those computer gets a reservation of 3% of the bandwidth. Voice traffic doesn't
need much bandwidth but it is very sensitive for delays.
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