Call Features
157
Call Transfer
Call transfer enables IP phones to transfer an existing call to a third party. For example, if party A is in an active call with
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 IP 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 a
simple REFER method without Replaces in the Refer-To header.
l Semi-attended Transfer -- Transfer a call after hearing the ringback tone. The semi-attended transfer is imple-
mented by a REFER method with Replaces in the Refer-To header.
The semi-attended transfer is applicable to that when users do not want to consult with the third party after hearing
the ringback tone, and the third party has not answered the call, the users can cancel transfer or implement transfer.
l Attended Transfer (Consultative Transfer) -- Transfer a call with prior consulting. Attended transfer is imple-
mented by a REFER method with Replaces in the Refer-To header.
Topic
Call Transfer Configuration
Call Transfer Configuration
The following table lists the parameters you can use to configure call transfer.
Parameter transfer.semi_attend_tran_enable <y0000000000xx>.cfg
Description It enables or disables the semi-attended transfer.
Permitted
Values
0-Disabled, when the user presses the TRANkey after hearing the ringback tone, the IP phone will blind
transfer the call.
1-Enabled, when the user presses the TRAN key after hearing the ringback tone, the IP phone will transfer
the call after the transferee answers the call.
Default 1
Web UI Features->Transfer->Semi-Attended Transfer
Parameter
account.X.transfer_refer_to_contact_header.enable
[1]
<MAC>.cfg
Description
It enables or disables the Refer -To header to use the information of the Contact header in the second 200
OK message when attended transfer.
Permitted
Values
0-Disabled
1-Enabled
Default 0
Parameter transfer.blind_tran_on_hook_enable <y0000000000xx>.cfg
Description
It enables or disables the IP phone to complete the blind transfer through on-hook besides pressing the
TRAN key.
Note: Blind transfer means transfering a call directly to another party without consulting.
Permitted
Values
0-Disabled
1-Enabled
Default 1
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