In asterisk 11, when you create a confbridge, we can put whatever name it creates bridges with numbers and in ascending order.
Ex: confbridge.conf
[SALA1]
Type = bridge
Max_members = 10
Language = en
[SALA2]
Type = bridge
Max_members = 10
Language = en
Buttons_custon.conf
[CONFERENCE / 1]
Type = conference
Label = SALA 1
Server = 1
Extension = 500
Context = conference
[CONFERENCE / 2]
Type = conference
Label = SALA 2
Server = 1
Extension = 510
Context = conference
So it worked perfectly with fop2