Causes Of Unidirectional Communication; Causes Of Crosstalk; Causes Of Disconnection; Ip Phone Is Disconnected From The Network - Huawei eSpace 6805 Administrator's Manual

Huawei IP Phone eSpace
6805&6810&6830&6850&6870
Administrator Guide
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4.2.2 Causes of Unidirectional Communication

In the case of unidirectional communication on the PSTN network, you can determine the
upper-level office fault or the internal office fault by making a call on a specified trunk circuit.
If no fault is found after making calls on all the trunk circuits, check the internal office fault.
In the case of unidirectional communication in the internal office, you can use the packet
capture tool to analyze whether the network settings are correct. The internal office fault may
be the hardware or software fault:
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Common faults are as follows:
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4.2.3 Causes of Crosstalk

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4.2.4 Causes of Disconnection

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4.2.5 IP Phone Is Disconnected from the Network

Problem
The IP phone screen is abnormally displayed. For example, 0.0.0.0 is displayed on the screen.
Issue 01 (2012-06-20)
A label on the large package box of IP phones, where MAC addresses of all the IP
phones are contained, is specially designed for MAC addresses.
The MAC address of the IP phone is pasted on the small package box of each IP phone.
In addition, the MAC address of an IP phone is pasted in the rear of the IP phone.
Hardware faults can be often detected. According to the symptom, a fault occurs in an
office direction or a fault often occurs. To locate the hardware fault, attempt to replace
the hardware for testing, such as switching the MCU and replacing the trunk board or
terminal. The overall principle is to trace the call where a fault occurs, make a summary
of fault occurrence, analyze the causes one by one, and locate the actual cause.
To locate the software fault, trace the call information when the fault occurs step by step
and describe the scenario and recurrence conditions carefully. Then send the information
to the R&D personnel for further analysis.
Media streams cannot be transmitted. Check the network setting.
eSpace 6805, eSpace 6810, eSpace 6830, eSpace 6850, and eSpace 6870 receive extra
RTP messages. That is, two devices send RTP messages to an IP phone simultaneously.
The IP phone or headset is incorrectly connected to an interface. The headset interfaces
of eSpace 6830, adopt RJ-9 and the IP phone interfaces also adopt RJ-9. Verify that the
IP phone or headset is correctly connected to an interface.
eSpace 6805, eSpace 6810,eSpace 6830, eSpace 6850, and eSpace 6870 support RTP
encryption. If RTP encryption is enabled on the IP phone but encryption is disabled on
the peer end, unidirectional communication may occur. Check that RTP encryption is
enabled or disabled simultaneously on the two parties.
The MAC addresses of the IP phone conflict. There is a small possibility of this cause.
The session is not synchronized on the lower-level NAT firewall when the SBC is used.
The network runs abnormally. As a result, the connection is interrupted.
SoftCo media resources are insufficient.
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