Yealink SIP-T48G Administrator's Manual page 227

Configuring Basic Features
Parameters Permitted Values Default
Menu->Features->Call Forward->Always Forward->Off Code
0 or 1 0
account.X.busy_fwd.enable
Description:
Enables or disables busy forward feature for account X when the call forward mode
is configured as Custom.
0-Disabled
1-Enabled
If it is set to 1 (Enabled), incoming calls to the account X are forwarded to the
destination number when the callee is busy.
X ranges from 1 to 16 (for SIP-T48G/T46G/T29G).
X ranges from 1 to 12 (for SIP-T42G).
X ranges from 1 to 6 (for SIP-T41P/T27P).
X ranges from 1 to 3 (for SIP-T23P/G).
X ranges from 1 to 2 (for SIP-T21(P) E2).
Web User Interface:
Features->Forward& DND->Forward->Busy Forward->On/Off
Phone User Interface:
Menu->Features->Call Forward->Busy Forward->Busy Forward
account.X.busy_fwd.target String within 32 characters Blank
Description:
Configures the destination number of the busy forward for account X when the call
forward mode is configured as Custom.
X ranges from 1 to 16 (for SIP-T48G/T46G/T29G).
X ranges from 1 to 12 (for SIP-T42G).
X ranges from 1 to 6 (for SIP-T41P/T27P).
X ranges from 1 to 3 (for SIP-T23P/G).
X ranges from 1 to 2 (for SIP-T21(P) E2).
Example:
account.1.busy_fwd.target = 3602
Web User Interface:
Features->Forward& DND->Forward->Busy Forward->Target
Phone User Interface:
Menu->Features->Call Forward->Busy Forward->Forward to
213