Call Transfer; Call Transfer Configuration - Yealink SIP-T3 Administrator's Manual

Administrator's Guide for SIP-T2 /T3 /T4 /T5 /CP920 IP Phones

Call Transfer

Call transfer enables the 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 phones support call transfer using the REFER method specified in
fer:
Blind Transfer -- Transfer a call directly to another party without consulting. Blind transfer is implemented by a
l
simple REFER method without Replaces in the Refer-To header.
Semi-attended Transfer -- Transfer a call after hearing the ringback tone. The semi-attended transfer is imple-
l
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 hear-
ing the ringback tone, and the third party has not answered the call, the users can cancel the transfer or imple-
ment the transfer.
Attended Transfer (Consultative Transfer) -- Transfer a call with prior consulting. Attended transfer is imple-
l
mented by a REFER method with Replaces in the Refer-To header.
Topics

Call Transfer Configuration

Transfer Mode for Dsskey Configuration
Call Transfer Configuration
The following table lists the parameters you can use to configure call transfer.
Parameter features.transfer.allow
Description It enables or disables the call transfer feature.
0-Disabled, call transfer feature is not available to users.
Permitted
Values
1-Enabled
Default 1
Supported
T57W, T54W, T53W, T53, T53C, T48U, T46U, T43U, T42U, T33P, T33G, T31P, T31G, T31, T30P, T30
Devices
Parameter transfer.semi_attend_tran_enable
Description It enables or disables the semi-attended transfer.
0-Disabled, when the user presses the Trans/Transfer soft key after hearing the ringback tone, the
phone will blind transfer the call.
Permitted
Values
1-Enabled, when the user presses the Trans/Transfer soft key after hearing the ringback tone, the
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
It enables or disables the Refer-To header to use the information of the Contact header in the second
Description
200 OK message when attended transfer.
Permitted
0-Disabled
1-Enabled
Values
456
RFC 3515 and offer three types of trans-
<y0000000000xx>.cfg
<y0000000000xx>.cfg
[1]
<MAC>.cfg