A31003-D3000-M100-02-76A9, 11-2013
OpenScape Desk Phone IP V3R3, Phone Administration, Administrator Documentation
59
Administration
IP Network Parameters
•
Specific IP Routing
•
DNS
•
Configuration & Update Service (DLS)
•
SNMP
3.3.1 Quality of Service (QoS)
The QoS technology based on layer 2 and the two QoS technologies Diffserv and
TOS/IP Precedence based on layer 3 are allowing the VoIP application to request
and receive predictable service levels in terms of data throughput capacity
(bandwidth), latency variations (jitter), and delay.
INFO:
Layer 2 and 3 QoS for voice transmission can be set via
LLDP-MED (see
LLDP-MED
). If so, the value can not be changed
by any other interface.
Related Topics
Related Topics
•
IP Network Parameters
•
Layer 2 / IEEE 802.1p
•
Layer 3 / Diffserv
3.3.1.1 Layer 2 / IEEE 802.1p
QoS on layer 2 is using 3 Bits in the IEEE 802.1q/p 4-Byte VLAN tag which has
to be added in the Ethernet header.
The CoS (class of service) value can be set from 0 to 7. 7 is describing the highest
priority and is reserved for network management. 5 is used for voice (RTP-
streams) by default. 3 is used for signaling by default.
Data required
•
Layer 2: Activates or deactivates QoS on layer 2. Value range: "Yes", "No"
Default: "Yes"
•
Layer 2 voice: Sets the CoS (Class of Service) value for voice data (RTP
streams). Value range: 0-7 Default: 5
•
Layer 2 signalling: Sets the CoS (Class of Service) value for signaling. Value
range: 0-7 Default: 3
Three Bits Used for CoS (User Priority)
PREAM.
SFD
DA
SA
TAG 4
Bytes
PT
DATA
FCS