Yealink SIP-T2 SERIES Administrator's Manual page 420

Administrator's Guide for SIP-T2 Series/T19(P) E2/T4 Series/CP860 IP Phones
Details of the Configuration Parameter:
transfer.dsskey_deal_type
Description:
Configures the transfer mode when user presses the DSS key during an active call.
To use this feature, you need to configure the DSS key as a speed dial, transfer or
BLF/BLF List in advance.
0-New Call
1-Attended Transfer
2-Blind Transfer
Note: It is not applicable to SIP-T19(P) E2 and CP860 IP phones.
Web User Interface:
Features->Transfer->Transfer Mode via Dsskey
Phone User Interface:
None
To configure transfer mode via dsskey via web user interface:
1. Click on Features->Transfer.
2. Select the desired value from the pull-down list of Transfer Mode via Dsskey.
3. Click Confirm to accept the change.
Allow trans exist call feature allows users to select transfer-to party's call during multiple
calls. It is convenient to transfer the active call to another existing call. It is not
applicable to SIP VP-T49G/SIP-T48G/T46G/T29G IP phones.
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Parameters Permitted Values Default
0, 1 or 2 2