I have a BCM50 with 2 of the analog ports active. I am trying to use Polycom soundstation2s and do a 3 party conference. I have tried to change the Flash ms I have tried flash 2 and flash 71 and neither works. I thought you dialed the first number, pressed flash 2 then when you got dial tone dialed the second number and pressed flash #3 . When I do the first flash 2 it hangs up on the call. Does anyone have any suggestions?? Thank you