
Efficient Networking 159
IP Telephony Configuration Guide
QoS Monitoring Bandwidth Requirement
The VoIP Quality-of-Service (QoS) Monitor periodically monitors the delay and packet-loss of IP
networks between two peer gateways, e.g., Business Communications Manager to Business
Communications Manager, by using a proprietary protocol. The main objective of the QoS
Monitor is to allow new VOIP calls to fall back to the PSTN if the IP network is detected as bad in
terms of delay and packet-loss. For more details about configuring QoS Monitoring, refer to the
Business Communications Manager Programming Operations Guide.
The monitoring packets are delivered at UDP port 5000. If you use QoS Monitoring in your
gateway setting, please refer to the following paragraph for a description of bandwidth
requirement of QoS Monitoring.
There are a total of 25 monitoring packets traveling in each direction every 15 seconds. Each of
monitoring packages has 88 bytes in IP layer. These monitoring packets are equally spaced out in
the 15-second intervals. For example, if there are two Business Communications Managers,
BCM-A and BCM-B, connected to each other with QoS Monitoring enabled, then in every
15 seconds there are 25 monitoring packets going from BCM-A to BCM-B and then back to
BCM-A. Similarly, 25 packets go from BCM-B to BCM-A, then back to BCM-B.
In other words, in this case the overhead in IP layer caused by these monitoring packets is about
(2x25x88)/15= 293 bytes/second in one direction.
Additional feature configuration
This section contains additional information about configuring your network to run efficiently.
Refer to the information under the following headings for details:
• “Setting Non-linear processing”
• “Determining network loading caused by IP telephony traffic” on page 160
Setting Non-linear processing
Non-linear processing should normally be enabled.
To set non-linear processing:
1 In Unified Manager, open Services, IP Telephony, and click H.323 settings.
The H.323 parameters appear in the right window.
2 From the Non-linear processing menu, select either Enabled or Disabled.
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