Avaya BCM 2.0 IP Telephony Manual de usuario descargar pdf (Pagina 26)

26 Engineering guidelines

Enterprise Edge 2.0 IP Telephony Configuration Guide P0911590 Issue 02

Setting QoS

The users of corporate voice and data services expect these services to meet a level

of quality of service (QoS) which in turn affect network design. The purpose is to

design and allocate enough resources in the network to meet user needs. QoS

metrics or parameters help in meeting the needs required by the user of the service.

There are two interfaces that the installer needs to consider:

• IP telephony interfaces with the end users; voice services made available need

to meet user QoS objectives.

• The gateways interface with the intranet; the service provided by the intranet is

“best-effort delivery of IP packets,” not guaranteed QoS for real-time voice

transport. IP telephony translates the QoS objectives set by the end users into IP

adjusted QoS objectives. The guidelines call these objectives the intranet QoS

objectives.

Figure 4 Relationship between users and services

The IP gateway can monitor the intranet’s QoS. In this mode, two parameters, the

receive fallback threshold and the transmit fallback threshold control the minimum

QoS level of the intranet. Fallback thresholds are set on pair per site basis.

The QoS level is aligned for user QoS metrics that allow to set an acceptable Mean

Opinion Score (MOS) level. The administrator can adjust the fallback thresholds to

provide acceptable service to the users.

Table 4 Quality of voice service

MOS Range Qualitative Scale

4.86 to 5.00 Excellent

3.00 to 4.85 Good

2.00 to 2.99 Fair

1.00 to 1.99 Poor

- Fallback threshold

- Codec

Enterprise Edge IP telephony parameters

- Silence compression

- Echo cancellation

- Non-linear programming

Corporate

intranet

Deliver voice/

fax service

Deliver IP

service

User oriented QoS

- Roundtrip conversation delay

- Clipping and dropout

- echo

Network QoS metrics

- One-way delay

- Packet loss

Enterprise

Edge VoIP

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Avaya BCM 2.0 IP Telephony Manual de usuario Pagina 26

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