[Freeswitch-users] mod_fifo and group_confirm_key

I recently try mod_fifo which are working great for the most cases, but I come by scenario that I'm not sure if that can be supported by mod_fifo. There are 3 static agent for a queue, dialstring contains 'group_confirm_key=1'. When call come into the queue, Freeswitch dial first member, and asking for digit confirmation. When this agent did not press confirmation key, Freeswitch keep re-dialing the same agent over and over again. Is above the correct behaviour? Is there any setting that would make FS to move on and try next agent in sequence. Thank in advance. Johny Kwan