Specifications

Engineering Guidelines
336
For the controllers, or servers, VLAN and priority is also needed. However, this can be
configured in different places. The VLAN, and priority, information can be added at the network
access point. In this case all information will carry the voice VLAN, but will also carry equal
priority for all services. It is also possible to differentiate services and overwrite the VLAN priority
by mapping the type of service (Layer 3) priority field into the VLAN priority field. This is
sometimes described as ‘TOS to COS’ or ‘DSCP to COS’ conversion.
Alternatively, the VLAN can be added at the server/controller and the network access point
configured to accept VLAN information.