Call Features255Parameter features.feature_key_sync.enable .cfgDescription It enables or disables to synchronize the feature status between the IP phone and the server.PermittedValues0-Disabled1-Enabled, the phone send a SUBSCRIBE message with event “as-feature-event” to the server.Default 0Parameter features.forward.feature_key_sync.enable .cfgDescriptionIt enables or disables the forward feature synchronization.Note: It works only if “features.feature_key_sync.enable” is set to 1 (Enabled).PermittedValues0-Disabled1-Enabled, server-based call forward is enabled. Server and local phone call forward are synchronized.Default 1Parameter features.forward.feature_key_sync.local_pro-cessing.enable .cfgDescriptionIt enables or disables the local forward when call forward feature synchronization is enabled.Note: It works only if “features.feature_key_sync.enable” and “features.forward.feature_key_sync.enable”are set to 1 (Enabled). The value configured by the parameter “account.X.features.forward.feature_key_sync.local_processing.enable” takes precedence over that configured by this parameter.PermittedValues0-Disabled, call forward is performed on the server side only.1-Enabled, call forward is performed on both server side and locally.Default 0Parameter account.X.features.forward.feature_key_sync.local_processing.enable[1] .cfgDescriptionIt enables or disables the local forward when call forward feature synchronization is enabled.Note: It works only if “features.feature_key_sync.enable” and “features.forward.feature_key_sync.enable”are set to 1 (Enabled).PermittedValues0-Disabled, call forward is performed on the server side only.1-Enabled, call forward is performed on both server side and locally.Default Blank[1]X is the account ID. For T58V/T58A/T56A, X=1-16; for CP960, X=1.Call TransferCall transfer enables the phones to transfer an existing call to a third party. For example, if party A is in an active callwith party B, party A can transfer this call to party C (the third party). Then, party B will begin a new call with party C,and party A will disconnect.Yealink phones support call transfer using the REFER method specified in RFC 3515 and offer three types of transfer:l Blind Transfer -- Transfer a call directly to another party without consulting. Blind transfer is implemented by asimple REFER method without Replaces in the Refer-To header.