[Asterisk-Users] Problem registering Asterisk Dual Server

[Joseph]

Here is my configuration everything would seems be straight forward, but
I can not register both asterisk with each other.

Both asterisks have Static IP but they are  behind firewall/router, so
it means I have to use Register statement.  
I'm a bit confused about the register statement.  
How can they can register with each other when both firewalls are
blocking port 4569?

Do I have to open ports 4569 on both servers in order to register them
with each other?

========================
SERVER 1:
register => Ast-1-in:password1 at IP-address

[Ast-2-in]
type=user
secret=password2
context=incoming
disallow=all
allow=ulaw
;trunk=yes

[Ast-2-out]
type=peer
disallow=all
allow=ulaw
host=dynamic

==========================
SERVER 2:
register => Ast-2-in:password2 at IP-address

[Ast-1-in]
type=user
secret=password1
context=incoming
disallow=all
allow=ulaw
;trunk=yes

[Ast-1-out]
type=peer
disallow=all
allow=ulaw
host=dynamic


-- 
#Joseph