Yealink SIP-T21 E2 Administrator's Guide

Troubleshooting
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2. Select Enabled from the pull-down list of Span to PC Port.
3. Click Confirm to accept the change.
A dialog box pops up to prompt that the settings will take effect after a reboot.
4. Click OK to reboot the phone.
Then you can use Sniffer, Ethereal or Wireshark software to capture the signal traffic.
Enabling Watch Dog Feature
The IP phone provides a troubleshooting feature called “Watch Dog”, which helps you monitor
the IP phone status and provides the ability to get stack traces from the last time the IP phone
failed. If Watch Dog feature is enabled, the IP phone will automatically reboot when it detects a
fatal failure. This feature can be configured using the configuration files or via web user
interface.
Procedure
Watch Dog can be configured using the following methods.
Central Provisioning
(Configuration File)
<y0000000000xx>.cfg
Configure Watch Dog feature.
Parameter:
static.watch_dog.enable
Web User Interface
Configure Watch Dog feature.
Navigate to:
http://<phoneIPAddress>/servlet?p=
settings-preference&q=load

Yealink SIP-T21 E2 Specifications

General

Brand	Yealink
Model	SIP-T21 E2
Category	IP Phone
Language	English