On the PAP2, if you call a number and then press the flash (R) button on your phone, you get another dial tone and can then dial the second number, when they answer, press the flash button again and a 3 way call is then in progress. You can then hang up and the two phones you called will stay in the conversation, you could also stay on and talk with them. It may work on your softphone too, let us know if it does.
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