Configuring Quality Of Service - Cisco 1760 Quick Start Manual

Number of signaling protocol errors are 0
Impedance is set to 600r Ohm
Station name Chalil Mohanan, Station number 1234567
Voice card specific Info Follows:
Signal Type is wink-start
Dial Type is dtmf
In Seizure is inactive
Out Seizure is inactive
Digit Duration Timing is set to 100 ms
InterDigit Duration Timing is set to 100 ms
Pulse Rate Timing is set to 10 pulses/second
InterDigit Pulse Duration Timing is set to 750 ms
Clear Wait Duration Timing is set to 400 ms
Wink Wait Duration Timing is set to 200 ms
Wait Wink Duration Timing is set to 550 ms
Wink Duration Timing is set to 200 ms
Delay Start Timing is set to 300 ms
Delay Duration Timing is set to 2000 ms
Dial Pulse Min. Delay is set to 140 ms
Percent Break of Pulse is 60 percent
Auto Cut-through is disabled
Dialout Delay for immediate start is 300 ms

Configuring Quality of Service

The sections that follow provide an overview and brief explanations of Quality of Service (QoS) mechanisms. To ensure the best
QoS, you will need to configure various QoS mechanisms together. The examples in the following sections are given only to
illustrate various QoS concepts. To configure your router, please use the guidelines, commands and example configurations that
are given in the Cisco IOS Quality of Service Solutions Configuration Guide, Release 12.2 or later.
Voice traffic is much more sensitive to timing variations than data traffic. For good voice performance, you need to configure
your data network so that voice packets are not lost or delayed. To achieve the level of network performance needed for VoIP
connections, use the following features to improve QoS:
• IP Precedence
• Low Latency Queuing
• Multilink PPP with Link Fragmentation Interleave
• Real-Time Transport Protocol Header Compression
• Frame Relay Configuration for VoIP
Cisco IOS software provides many other tools for ensuring QoS, such as custom queuing, priority queuing, and weighted fair
queuing. For further information and more detailed examples of QoS configuration, refer to the "Congestion Management"
chapter in the Cisco IOS Quality of Service Solutions Configuration Guide, Release 12.2 or later.
Note QoS measures the level of network performance. It does not directly measure the quality of the voice signal.
Configuring VoIP on a Frame Relay link involves special considerations. See the "Frame Relay Configuration for VoIP" section
on page 34.
On a relatively low-bandwidth connection, such as a PPP or High-Level Data Link Control (HDLC) serial link, you should
consider using methods to ensure QoS. If you have a high-bandwidth network, such as Ethernet or Fast Ethernet, and voice and
data traffic together occupy only a small fraction of the bandwidth available, you might not need to provide QoS mechanisms.
(See Figure 24.)
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