Yealink SIP-T54S Administrator's Manual page 727

Phone User Interface
Record Key
For more information on how to configure the DSS Key, refer to
Key on page 1014.
Details of Configuration Parameters:
Parameters
linekey.X.type/
expansion_module.X.key.Y.type
Description:
Configures a DSS key as a record key on the IP phone.
The digit 25 stands for the key type Record.
For line keys:
X ranges from 1 to 29 (for SIP-T48G/S)
X ranges from 1 to 27 (for SIP-T54S/T46G/T46S/T29G)
X ranges from 1 to 15 (for SIP-T42G/T42S/T41P/T41S)
X ranges from 1 to 21 (for SIP-T52S/T27P/T27G)
X ranges from 1 to 3 (for SIP-T40P/T40G/T23P/T23G)
X ranges from 1 to 2 (for SIP-T21(P) E2)
For ext keys:
For SIP-T54S/T52S:
X ranges from 1 to 3, Y ranges from 1 to 60.
For SIP-T48G/T48S/T46G/T46S:
X ranges from 1 to 6, Y ranges from 1 to 40.
For SIP-T29G/T27P/T27G:
X ranges from 1 to 6, Y ranges from 1 to 20, 22 to 40 (Ext key 21 cannot be configured).
Example:
linekey.2.type = 25
Default:
For line keys:
Configuring Advanced Features
Navigate to:
http://<phoneIPAddress>/servlet?p
=dsskey&q=load&model=0
Assign a record key and URL record
key.
Appendix D: Configuring DSS
Permitted Values
Refer to the following
25
Default
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