Avaya BCM 2.0 IP Telephony Manual de usuario descargar pdf (Pagina 36)

36 Engineering guidelines

Enterprise Edge 2.0 IP Telephony Configuration Guide P0911590 Issue 02

utilization. When received, the WAN link marks the H.323 flows as Premium

traffic and places the flows in the high priority queue.

Note: Differentiated Service (DiffServ) is a QoS framework standardized by

IETF.

• In a non DiffServ or legacy network, the router manages the WAN link to make

sure Premium VoIP packets have high priority in both directions when crossing

a slow WAN link.

Implementing the network

LAN engineering

To minimize the number of router hops between the systems, connect the gateways

to the intranet, ensuring there is enough bandwidth on the WAN links shorter

routes. To prevent division of the constant bit-rate IP telephony traffic from bursty

LAN traffic, and make easier the end-to-end Quality of Service engineering for

packet delay, jitter, and packet loss, place the gateway and the LAN router near the

WAN backbone.

With supported codecs through the IP telephony network set to G.729, G.723.1 6.3

kbit/s, G.723.1 5.3 kbit/s, and G.711, ensure that up to 8 ports share the same

10BaseT LAN collision domain.

For the deployment of a mixed codec IP telephony, refer to Table 1 LAN and WAN

IP bandwidth usage per Enterprise Edge Gateway (loaded to 36 CCS per port per

hour) with silence compression on page 20 to estimate the amount of LAN

bandwidth used.

Setting the Quality of Service threshold for fallback routing

Configure the Quality of Service thresholds for fallback routing in the IP telephony

Manager application. Configure a threshold for both the receive fall back threshold

(Rx) and the transmit fall back threshold (Tx). The available thresholds are:

Excellent, Good, Fair, and Poor.

Table 8 Sample Mean Opinion Score to qualitative scale

Set the MOS values using the lowest number matching to the required threshold.

You can adjust the MOS values to fine tune the fallback scale.

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

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Avaya BCM 2.0 IP Telephony Manual de usuario Pagina 36