Voices On An Ip Phone Are Intermittent - Huawei espace 7810 Administrator's Manual

Huawei IP Phone eSpace
7810&7820&7830&7850&7870&7803X
Administrator Guide
Cause
The firewall is installed on the computer; therefore, NTP packets sent by the IP phone are
intercepted.
Troubleshooting
You can use either of the following methods to rectify the fault:
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Figure 4-8 Add a Port dialog box

4.2.9 Voices on an IP Phone Are Intermittent

Symptom
Voices on an IP phone are intermittent.
Cause
This fault is caused by packet loss or jitter.
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Troubleshooting
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Issue 01 (2011-12-31)
Disable the firewall on the computer.
Add a rule, which allows NTP packets to pass through the firewall. In the Add a Port
dialog box, set Port number to 123 (a port number frequently used by the NTP server),
select UDP, and set Name to any value, as shown in
Packet loss is caused by network congestion or insufficient device capabilities.
Jitter is caused by packet assembling on the transmitting device or receiving device, such
as the timeout processing, retransmission mechanism, and insufficient buffer.
Improve the network quality.
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4 Troubleshooting
Figure 4-8.
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