CounterPath Bria iPhone Edition User Guide (Revision 2) - Manual (Page 20)

CounterPath Corporation
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3.9 Attended Transfer
You can speak to the second person first then transfer the first person to them.
You know there are two calls established
because the Swap Calls button is showing.
Tap More
Establish two calls
(page 12)
When ready, tap Transfer to. The live
call is transfered to the on-hold call.