Yealink SIP-T54S Administrator's Manual page 487

Parameters
forward.busy.off_code
Description:
Configures the busy forward off code to deactivate the server-side busy forward feature.
The IP phone will send the busy forward off code to the server when you deactivate busy
forward feature on the IP phone.
Example:
forward.busy.off_code = *75
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->Off Code
Phone User Interface:
Menu->Features->Call Forward->Busy Forward->Off Code
forward.no_answer.enable
Description:
Triggers the no answer forward feature to on or off for the IP phone.
0-Off
1-On
If it is set to 1 (On), incoming calls are forwarded to the destination number (configured by
the parameter "forward.no_answer.target") after a period of ring time.
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->No Answer Forward->On/Off
Phone User Interface:
Menu->Features->Call Forward->No Answer Forward->No Answer Forward
forward.no_answer.target
Description:
Configures the destination number of the no answer forward for the IP phone.
Example:
Configuring Basic Features
Permitted Values Default
String within 32
Blank
characters
0 or 1
String within 32
Blank
characters
0
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