
24 Chapter 1 Introduction
P0937663 03.1
The header contains the network address of the sending and receiving IP telephones, and a TOS
(Type Of Service) byte, which contains a routing priority.
The IP telephone firmware establishes the TOS byte to the highest possible priority. This means
that, as the voice frame travels through the network, the routers it encounters give it higher routing
priority than competing data frames of information that do not require real-time processing, such
as file transfers, WEB downloads, e-mails, etc. This process of prioritizing data frames is Quality
of Service (QoS) routing.
The Business Communications Manager 2.5 system does QOS routing, but if one or more routers
along the network route do not support QOS routing, this can impact voice quality. Business
Communications Manager 2.5 system QoS can also be configured so that the system reverts to a
circuit-switched line if a suitable QoS cannot be guaranteed.
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