tseward,
From OBi user guide: Not as many bells and whiltles as that service.
Three Way Conference Calling with Local Mixing
The OBi PHONE port supports 3-way Calling when the second call is an outbound call.
On the first Hook Flash during an active call the OBi can make a second outbound call.
One the second hook flash, the first call and the second outbound call are place in a conference.
To remove the second conferenced party, invoke a third Hook Flash.
When the OBi goes On Hook during a 3-way Call, this will become a transfer when 2nd (outbound) call is ringing or connected. If the 2nd (outbound) call does not succeed, e.g. no answer or busy, then the OBi PHONE port can go to On Hook state and will ring as the holding call is still on the line, or simply hook flash to resume the first call.