Nortel Networks NN43001-563 - Manual (Page 70)

70 System description
Detection" must be selected (checked) in TM 3.1. See Figure 21 "DTMF
tone detection" (page 70) . For more information on how to configure the
IP Trunk 3.01 (and later) DSP, see "Configure DSP profiles for the IP Trunk
3.01 (and later) node" (page 242) . If the IP Trunk 3.01 (and later) node is
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:
• Round Trip Time (RTT)
• latency
• queuing delay in the intermediate nodes
• packet loss
• available bandwidth
Nortel Communication Server 1000
IP Trunk Fundamentals
NN43001-563 01.01 Standard
Release 5.0 30 May 2007
Copyright © 2007, Nortel Networks
.