Yealink SIP-T2 SERIES Administrator's Manual page 476

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
presents the connected line identification from the Remote-Party-ID header. If no,
the IP phone presents the connected line identification according to the dialed
digits.
Yealink IP phones present the connected line identification according to the dialed
digits.
Yealink IP phones support to present the connected line identification from UPDATE
message following the RFC 4916.
1) The IP phone receives an UPDATE message during a call, the connected line
identification on the LCD screen should be refreshed according the FROM SIP
carried in the UPDATE message.
For more information on connected line identification presentation, refer to
Connected Line Identification Presentation on Yealink IP Phones
Procedure
COLP can be configured only using the configuration files.
Configuration File
Details of the Configuration Parameter:
account.X.cp_source
Description:
Configures the presentation of the callee's identity for account X.
0-PAI-RPID
1-Dialed Digits
2-RFC 4916
454
<MAC>.cfg
Parameter
RFC4916
.
Configure the presentation of
the callee's identity.
Parameter:
account.X.cp_source
Specify whether to process
Privacy header field.
Parameter:
account.X.cid_source_privacy
Permitted Values
0, 1 or 2
Calling and
Default
0