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Yealink SIP-T21 E2

Yealink SIP-T21 E2
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Setting Up Your System
113
3. Select STUN/Manual NAT from the pull-down list of NAT.
4. Click Confirm to accept the change.
To configure local SIP port and TLS SIP port via web user interface:
1. Click on Settings->SIP.
2. Enter the desired local SIP port in the Local SIP Port field.
3. Enter the desired TLS SIP port in the TLS SIP Port field.
4. Click Confirm to accept the change.

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