Yealink SIP-T2 SERIES Administrator's Manual page 926

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
Details of Configuration Parameters:
account.X.sip_server.Y.transport_type
(X ranges from 1 to 16, Y ranges from 1 to 2)
Description:
Configures the type of transport protocol for SIP account X.
0-UDP
1-TCP
2-TLS
3-DNS-NAPTR
X ranges from 1 to 16 (for SIP VP-T49G/SIP-T48G/T46G/T29G)
X ranges from 1 to 12 (for SIP-T42G)
X ranges from 1 to 6 (for SIP-T41P/T27P)
X ranges from 1 to 3 (for SIP-T40P/T23P/T23G)
X ranges from 1 to 2 (for SIP-T21(P) E2)
X is equal to 1 (for SIP-T19(P) E2/CP860)
Web User Interface:
Account->Register->SIP Server Y->Transport
Phone User Interface:
None
902
Parameters
http://<phoneIPAddress>/servlet?m=m
od_data&p=trusted-cert&q=load
Configure server certificates feature.
Upload the server certificates.
Navigate to:
For
SIP-T48G/T46G/T42G/T41P/T40P/T29G/
T27P/T23P/T23G/T21(P) E2/T19(P)
E2/CP860:
http://<phoneIPAddress>/servlet?p=ser
ver-cert&q=load
For SIP VP-T49G:
http://<phoneIPAddress>/servlet?m=m
od_data&p=server-cert&q=load
Permitted Values
0, 1, 2 or 3
Default
0