Yealink SIP-T2 SERIES Administrator's Manual page 690

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Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones

Select DNS-NAPTR from the pull-down list of Transport.

If you use outbound proxy servers, do the following:

1) Select Enabled from the pull-down list of Enable Outbound Proxy Server.

2) Configure parameters of outbound proxy server 1/2 in the corresponding fields.

You must set the port of outbound proxy server to 0 for NAPTR, SRV and A

Click Confirm to accept the change.