Yealink SIP-T2 SERIES Administrator's Manual page 465

Parameters
X ranges from 1 to 21 (for SIP-T27P)
X ranges from 1 to 3 (for SIP-T40P/T23P/T23G)
X ranges from 1 to 2 (for SIP-T21(P) E2)
For ext keys:
X ranges from 1 to 6, Y ranges from 1 to 20, 22 to 40 (Ext key 21 cannot be
configured).
Note: It is not applicable to SIP-T19(P) E2 and CP860 IP phones.
Web User Interface:
DSSKey->Line Key->Label
Phone User Interface:
Menu->Features->DSS Keys->Line Key X->Label
Retrieve Park Key
For more information on how to configure the DSS Key, refer to
DSS Key on page 940.
Details of Configuration Parameters:
Parameters
linekey.X.type/
expansion_module.X.key.Y.type
Description:
Configures a DSS key as a call park key on the IP phone.
The digit 56 stands for the key type Retrieve Park.
For line keys:
X ranges from 1 to 29 (for SIP VP-T49G/SIP-T48G)
X ranges from 1 to 27 (for SIP-T46G/T29G)
X ranges from 1 to 15 (for SIP-T42G/T41P)
X ranges from 1 to 21 (for SIP-T27P)
X ranges from 1 to 3 (for SIP-T40P/T23P/T23G)
X ranges from 1 to 2 (for SIP-T21(P) E2)
For ext keys:
X ranges from 1 to 6, Y ranges from 1 to 20, 22 to 40 (Ext key 21 cannot be
configured).
Example:
Configuring Basic Features
Permitted Values
Appendix D: Configuring
Permitted Values
56
Default
Default
Refer to the
following content
443