Environmental Requirements For Voip - Siemens HiPath 3000 Series Service Documentation

h3h5_in_the_lan.fm
HiPath 3000/5000 in the LAN Network
HG 1500 Board
13.6.4.5

Environmental Requirements for VoIP

To ensure voice transfer quality and avoid unacceptable delays, the networks being used must
meet certain requirements.
Environmental Requirements in the LAN
LANs used for VoIP must meet the following specifications:
At least 256 Kbps transmission capacity per networked unit
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Not more than 50 msec delay in one direction (One Way Delay) Not more than 150 msec
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total delay
Not more than 1% packet loss
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QoS support – IEEE802.1p, DiffServ (RFC 2474) or ToS (RFC 791)
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Every HG 1500 must be connected via a switch or a dedicated port of a router.
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It is recommended that the VoIP application be connected via a separate VLAN to reduce
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collisions with other transmissions. If all involved devices support VLAN (in accordance
with IEEE802.1q), all VoIP traffic can be placed in a separate VLAN. For administration ac-
cess in this case, LAN switches must provide individual computers with access to multiple
VLAN segments.
Not more than 20% of the available bandwidth should be used.
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Not more than 10% of the total data traffic should be broadcast packets.
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The error rate should not amount to more than 1% of data traffic and should not tend to
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increase.
Environmental Requirements in the WAN
LANs that are linked over WANs and share the same VoIP functionality must meet the following
minimum requirements:
Each LAN must each be connected to the Internet via xDSL with a fixed IP address.
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QoS support – IEEE802.1p, DiffServ (RFC 2474) or ToS (RFC 791) – over the entire con-
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nection
The bandwidth required for the calls must always be available in both directions, to the net-
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work and to the user.
Not more than 50 msec delay in one direction (One Way Delay) Not more than 150 msec
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total delay
Not more than 3% packet loss
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Not more than 3% error rate
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13-24
Nur für den internen Gebrauch
A31003-H3590-S100-7-7620, 06/2012
HiPath 3000/5000 V9, Service documentation