Yealink SIP-T54S Administrator's Manual page 681

Configuring Advanced Features
Details of Configuration Parameters:
Parameters Permitted Values Default
account.X.shared_line 0, 1 or 3 0
Description:
Configures the registration line type for account X.
0-Disabled
1-Shared Call Appearance
3-Draft BLA
If it is set to 0 (Disabled), the shared line feature is disabled.
X ranges from 1 to 16 (for SIP-T54S/T48G/T48S/T46G/T46S/T29G)
X ranges from 1 to 12 (for SIP-T52S/T42G/T42S)
X ranges from 1 to 6 (for SIP-T41P/T41S/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)
X is equal to 1 (for SIP-T19(P) E2/CP860/CP920)
Web User Interface:
Account->Advanced->Shared Line
Phone User Interface:
None
String within 32
account.X.shared_line_callpull_code Blank
characters
Description:
Configures the call pull feature access code to retrieve an existing call from another shared
phone that is in active or public hold status for account X.
X ranges from 1 to 16 (for SIP-T54S/T48G/T48S/T46G/T46S/T29G)
X ranges from 1 to 12 (for SIP-T52S/T42G/T42S)
X ranges from 1 to 6 (for SIP-T41P/T41S/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)
Note: It works only if the value of the parameter "account.X.shared_line" is set to 1 (Share
Call Appearance). It is not applicable to SIP-T19(P) E2/CP860/CP920 IP phones.
Web User Interface:
Account->Advanced->Call Pull Feature Access Code
Phone User Interface:
655