Forward openser calls to asterisk remotely

I friends,

I’m trying to forward openser calls to remote asterisk. I’m able to do it if both in same machine. But I need to put both in different machine for some reason. But its not working. I think its something wrong with the way I register openser to asterisk

[openser]
type=friend
user=user
secret=pass
context=default
host=AAA.BBBB.CCCC.DDDD
insecure=very

this is how I register openser in sip.conf.

Am I miss something? or I need to add configure somewhere else?

Thanks in advance.