Yealink SIP-T2 SERIES Administrator's Manual page 385

Diversion/History-Info
IP phones support the redirected call information sent by the SIP server with Diversion header,
per draft-levy-sip-diversion-08, or History-info header, per RFC 4244. The Diversion/History-info
header is used to inform the IP phone of a call's history. For example, when a phone has been
set to enable call forward, the Diversion/History-info header allows the receiving phone to
indicate who the call was from, and from which phone number it was forwarded.
Forward International
Forward international allows users to forward an incoming call to an international telephone
number (the prefix is 00). This feature is enabled by default.
Forward Emergency
Forward emergency allows the incoming calls from some authorized numbers not to be
forwarded when the call forward feature is enabled. The incoming call will not be logged in the
Forwarded Calls list. This feature is disabled by default.
Procedure
Call forward can be configured using the configuration files or locally.
Configuration File
<MAC>.cfg
Configuring Basic Features
Configure call forward in custom
mode.
Parameters:
account.X.always_fwd.enable
account.X.always_fwd.target
account.X.always_fwd.on_code
account.X.always_fwd.off_code
account.X.busy_fwd.enable
account.X.busy_fwd.target
account.X.busy_fwd.on_code
account.X.busy_fwd.off_code
account.X.timeout_fwd.enable
account.X.timeout_fwd.target
account.X.timeout_fwd.timeout
account.X.timeout_fwd.on_code
account.X.timeout_fwd.off_code
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