Administrator’s Guide for SIP-T2 Series/T19(P) E2/T4 Series IP Phones
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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.