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Making Call Transfers Using Bfv
November 2009 177
Making Call Transfers Using Bfv
The diagram in Figure 10 illustrates a transfer using the
BfvLineTransfer high level call transfer function.
The application issues a BfvLineTransfer function call to transfer
a call. BfvLineTransferCapabilityQuery checks the transfer
capability through LINE_XFER_ queries. If the line is capable of the
transfer type requested (such as transferring using two B-channels,
LINE_XFER_TWO_CHAN), then the call is placed on hold with
BfvCallHold while the other line is checked for availability with
BfvCallSetup. The call is transferred and supervised until either
party ends the call. BfvLineTransferComplete notifies the
application that the lines are connected.
If all conditions follow true, the application successfully transfers the
call. If a statement runs into a false condition, only the enquiry call
ends.
For more information on the messages, please refer to Volume 2 of
the Bfv API Reference Manual for specific messages.