Filter
Top Products
QoS
Issue 4 August 2006 85
# GROUP40
{specify settings unique to Group 40, for example}
SET COVERAGEADDR "23000"
SET SIPPROXYSRVR "{IP Address of server2}"
SET SIPREGISTRAR "{IP Address of server2}"
goto END
# END
{specify settings common to all Groups}
QoS
The 4600 Series IP Telephones support both IEEE 802.1D/Q and DiffServ. Other
network-based QoS initiatives such as UDP port selection do not require support by the
telephones. Those initiatives nonetheless can contribute to improved QoS for the entire
network.
IEEE 802.1D and 802.1Q
IEEE’s 802.1Q standard defines a tag that can be added to voice and data packets. Most of the
information associated with this tag deals with Virtual LAN (VLAN) management, but 3 bits are
reserved for identifying packet priority. These 3 bits allow any one of 8 priorities to be assigned
to a specific packet. As defined in the standard, the 8 priorities are, from highest to lowest:
● 7: Network management traffic
● 6: Voice traffic with less than 10ms latency
● 5: Voice traffic with less than 100ms latency
● 4: “Controlled-load” traffic for mission-critical data applications
● 3: Traffic meriting “extra-effort” by the network for prompt delivery, for example, executives’
e-mail
● 2: Reserved for future use
● 0: Traffic meriting the network’s “best-effort” for prompt delivery. This is the default priority.
● 1: Background traffic such as bulk data transfers and backups
Note:
Note: Priority 0 is a higher priority than Priority 1.