eSpace 6805 IP Phone
Administrator Guide
5 Troubleshooting
Issue 01 (2014-01-06)
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
75
5.2.11 IP Phone Rings When Receiving a Call, but Nothing Is
Heard When the IP Phone Is Picked Up
Problem
The IP phone rings when receiving a call, but nothing is heard when the IP phone is picked
up.
Cause
This fault occurs when signaling messages can be transmitted but media streams cannot be
transmitted. This is because signaling messages are transmitted by a server and media streams
are transmitted from end to end.
Solution
Check the network configuration to ensure that the devices between which the RTP channel is
set up are interconnected.
5.2.12 IP Phone Cannot Obtain Time from the NTP Server
Problem
When the computer functions as the NTP server, the IP phone cannot obtain the time.
Cause
The firewall is installed on the computer; therefore, NTP packets sent by the IP phone are
intercepted.
Solution
You can use either of the following methods to rectify the fault:
Disable the firewall on the computer.
Add a rule, which allows NTP packets to pass through the firewall. On the Exception tab
page of the firewall, add a port with the number being 123 (a port number frequently
used by the NTP server) and the protocol being UDP. The port name is customized.
