Siemens HiPath 3000 Series Service Documentation page 1121

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Quality of Service (QoS)
QoS enables voice packets to be given higher priority than other packets in the IP network so
that voice quality is influenced as little as possible by other data traffic.
To ensure the best possible quality especially for voice connections, the HG 1500 supports var-
ious QoS protocols:
IEEE802.1p Tags (level 2)
●
Type of Service (ToS) prioritization (RFC 791, layer 3)
●
Differentiated Services (DiffServ; RFC 2474, layer 3)
●
The gateway observes these standards for routed packets and makes them available for ap-
plications on the gateway.
Echo suppression
The HG 1500 supports echo suppression in accordance with G.168 to ensure acceptable voice
quality in the WAN. Echo suppression is effective for round trip delays of up to 48 msec.
Dynamic jitter buffer
The dynamic jitter buffer eliminates the distortion caused by fluctuations in the arrival of voice
and video packets. Individual packet delays can be a result of network overload or internal pro-
cessing within the LAN endpoints.
The HG 1500 jitter buffer can be configured for the connection requirements of a specific net-
work.
Voice Activity Detection
VAD (Voice Activity Detection) checks all incoming signals for voice signals. If a signal exceeds
a preset level, the VAD recognizes it as voice and anything under that level as silence.
The HG 1500 provides VAD and silence suppression for all supported codecs. When no voice
signal is detected, a background noise is inserted at each end of the line to emulate traditional
telephone line conditions.
A31003-H3590-S100-7-7620, 06/2012
HiPath 3000/5000 V9, Service documentation
HiPath 3000/5000 in the LAN Network
h3h5_in_the_lan.fm
HG 1500 Board
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