Yealink SIP-T21 - Manual (Page 132)

User Guide for the SIP-T21P/SIP-T21 IP Phone
122
2. Click Reboot to reboot the phone.
Note
How to export PCAP trace?
We may need you to provide a PCAP trace to help analyze your problem.
To export a PCAP trace via web user interface:
1. Click on Settings->Configuration.
2. Click Start to start recording signal traffic.
3. Recreate the error to be documented in the trace.
4. Click Stop to stop recording.
You can also long press the X key to reboot the phone directly. Any reboot of the phone
may take a few minutes.