Aastra Telecom SISIP 57I CT - Manual (Page 98)

Advanced Network Settings
4-32 41-001160-00, Rev 01 Release 2.0
IP Phone Administrator Guide
Configuring the IP Phones
Type of Service (ToS), Quality of Service (QoS), and DiffServ QoS
ToS is an octet as a field in the standard IP header. It is used to classify the traffic
of the different QoSs.
QoS provides service differentiation between IP packets in the network. This
service differentiation is noticeable during periods of network congestion (for
example, in case of contention for resources) and results in different levels of
network performance.
Port 0 is the Ethernet connected to the network. Port 1 is the Ethernet used for
passthrough to a PC.
Differentiated Service (DiffServ) QoS is class-based where some classes of traffic
receive preferential handling over other traffic classes.
The Differentiated Services Code Point (DSCP) value is stored in the first six bits
of the ToS field. Each DSCP specifies a particular per-hop behavior that is
applied to a packet.
The following parameters allow an administrator to configure ToS, QoS, and
DiffServ QoS for VLAN:
• tagging enabled
• tos priority map
• priority non-ip
• VLAN id
• VLAN id port 1
• QoS eth port 1 priority
• tos sip
• tos rtp
• tos rtcp