Yealink SIP-T4X, Administrator'S Manual

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Administrator’s Guide for SIP-T4X IP Phones
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3. Click Upload to upload the tar file.
The web user interface prompts the message ―Import config…‖.
4. In the VPN block, select the desired value from the pull-down list of Active.
5. Click Confirm to accept the change.
A dialog box pops up to prompt that settings will take effect after reboot.
6. Click OK to reboot the IP phone.
To configure VPN via phone user interface after uploading the tar file:
1. Press Menu->Advanced (password: admin) ->Network->VPN.
2. Press or , or the Switch soft key to select the desired value from the VPN
Active field.
3. Press the Save soft key to accept the change.
The IP phone reboots automatically to make settings effective after a period of
time.
Quality of Service (QoS) is the ability to provide different priorities to different packets in
the network, allowing the transport of traffic with special requirements. QoS guarantees
are important for applications that require fixed bit rate and are delay sensitive when
the network capacity is insufficient. There are four major QoS factors to be considered
when configuring a modern QoS implementation: bandwidth, delay, jitter and loss.