Quality Of Service - Nortel 1000 Fundamentals

70 System description
Callers can access traditional Voice Mail or IVR services (for example,
"Press 1 for more information" or "Press 2 to be connected to our customer
service department"). Services that depend on long DTMF bursts cannot
be accessed.
In order to ensure that DTMF tones are being transmitted properly, the DSP
must be configured correctly in TM 3.1. If the IP Trunk 3.01 (and later)
node is configured to use a voice codec other than G.711, "DTMF Tone
Detection" must be selected (checked) in TM 3.1. See
tone detection" (page
IP Trunk 3.01 (and later) DSP, see
3.01 (and later) node" (page
using G.711 without "DTMF Tone Detection" checked, there is no guarantee
that DTMF tones will be properly transmitted to the far end, due to the
possibility of latency or packet loss.
Figure 21
DTMF tone detection

Quality of Service

Quality of Service (QoS) is the gauge of quality of the IP network between
two nodes. As QoS degrades, existing calls suffer from poor voice and
fax quality. New calls will not be initiated if transmissions degrade below
an acceptable level.
Behavioral characteristics of the IP network depend on the following:
•
Copyright © 2007, Nortel Networks
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70). For more information on how to configure the
Round Trip Time (RTT)
Nortel Communication Server 1000
IP Trunk Fundamentals
NN43001-563 02.01 Standard
Release 5.5 21 December 2007
"Configure DSP profiles for the IP Trunk
244). If the IP Trunk 3.01 (and later) node is
Figure 21 "DTMF