Yealink SIP-T54S Administrator's Manual page 486

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/T5 Series/CP860/CP920 IP Phones
(except CP860 IP phones) and value of the parameter "features.fwd_mode" is set to 0
(Phone) (except SIP-T19(P) E2/CP860/CP920 IP phones).
Web User Interface:
Features->Forward&DND->Forward->Busy Forward->On/Off
Phone User Interface:
Menu->Features->Call Forward->Busy Forward->Busy Forward
forward.busy.target
Description:
Configures the destination number of the busy forward for the IP phone.
Example:
forward.busy.target = 3602
Note: It works only if the value of the parameter "features.fwd.allow" is set to 1 (Enabled)
(except CP860 IP phones) and value of the parameter "features.fwd_mode" is set to 0
(Phone) (except SIP-T19(P) E2/CP860/CP920 IP phones).
Web User Interface:
Features->Forward&DND->Forward->Busy Forward->Target
Phone User Interface:
Menu->Features->Call Forward-> Busy Forward->Forward to
forward.busy.on_code
Description:
Configures the busy forward on code to activate the server-side busy forward feature.
The IP phone will send the busy forward on code and the pre-configured destination
number (configured by the parameter "forward.busy.target") to the server when you
activate busy forward feature on the IP phone.
Example:
forward.busy.on_code = *74
Note: It works only if the value of the parameter "features.fwd.allow" is set to 1 (Enabled)
(except CP860 IP phones) and value of the parameter "features.fwd_mode" is set to 0
(Phone) (except SIP-T19(P) E2/CP860/CP920 IP phones).
Web User Interface:
Features->Forward&DND->Forward->Busy Forward->On Code
Phone User Interface:
Menu->Features->Call Forward->Busy Forward->On Code
460
Parameters Permitted Values Default
String within 32
Blank
characters
String within 32
Blank
characters