I've seen it done and cannot remember how. A customer of mine would like to be able to take an outside call, flash an outside line and transfer the call to another store. I understand that the conference button can do this, although the conference button will disconnect all parties once the person who originated the conference hangs up. I understand that the lines on the system must be centrex rich in order to accomplish the 3 way call, but I am at a loss for programming the flash button. I have also lost (let someone borrow it and it was never returned) my programming manual for the R5. Any suggestions on how to get another one without paying through the nose would be helpful.