Siemens OpenStage 15 Administration Manual

administration.fm
A31003-S2000-M102-2-76A9, 28/05/2009
OpenScape Voice - OpenStage Family, Administration Manual
3-13
Administration
IP Network Parameters
3.3 IP Network Parameters
3.3.1 Quality of Service (QoS)
The QoS technology based on layer 2 and the two QoS technologies Diffserv and TOS/IP Pre-
cedence 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.
3.3.1.1 Layer 2 / 802.1p
QoS on layer 2 is using 3 Bits in the 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.
• Layer 2 default: Sets the default CoS (Class of Service) value.
Value range: 0-7.
Default: 0.
>
Layer 2 and 3 QoS for voice transmission can be set via LLDP-MED (see Section
3.19.3, “LLDP-MED”). If so, the value can not be changed by any other interface.
Three Bits Used for CoS
(User Priority)
PREAM. SFD DA SA
TAG
4 Bytes
PT DATA FCS

Siemens OpenStage 15 Specifications

General

Type	IP Phone
Connectivity	Ethernet
Power over Ethernet (PoE)	Yes
Speakerphone	Yes
Keys	Fixed function keys
Headset Port	Yes
Protocols	SIP
Display	Monochrome display
Audio	G.711, G.729
Power Supply	PoE or external power adapter