TAPI provides two mechanisms for call transfer: blind transfer
and consultation transfer
- In blind transfer (or single-step transfer), an existing call is transferred
to a specified destination address in one phase using lineBlindTransfer.
- In a consultation transfer, the existing call is first prepared for transfer
to another address using lineSetupTransfer. This places the existing call on consultation hold, and identifies the call
as the target for the next transfer-completion request. The lineSetupTransfer function also allocates a consultation call that can be used to establish the
consultation call with the party to which the call will be transferred. The
application can dial the extension of the destination party on the consultation
call (using lineDial), or it can drop and deallocate the consultation call and instead activate an
existing held call (using lineUnhold), if supported by the switch.
While the initial call is on consultation hold and the consultation call is
active, the application can toggle between these calls using lineSwapHold
Finally, the application completes the transfer in one of two ways using lineCompleteTransfer
- Transfer the call on transfer hold to the destination party. Both calls will
revert to the idle state.
- Enter a three-way conference. A new call handle is created to represent the
conference and this handle is returned to the application.
In version 0x00020000 and greater, applications can use the "one step
transfer" feature of many PBXs (a single button press to establish a consultation
transfer) using LINECALLPARAMFLAGS_ONESTEPTRANSFER with lineSetupTransfer
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