Yealink SIP-T21 E2 Administrator's Guide

Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
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3. Enter the external IP address in the IP Address field.
4. Click Confirm to accept the change.
A dialog box pops up to prompt that the settings will take effect after a reboot.
5. Click OK to reboot the phone.
To configure ICE feature via web user interface:
1. Click on Network->NAT.
2. In the ICE block, select the desired value from the pull-down list of Active.
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.
To configure NAT traversal for account via web user interface:
1. Click on Account->Register.
2. Select the desired account from the pull-down list of Account.

Yealink SIP-T21 E2 Specifications

General

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