[asterisk-users] IAX2 register refuse but Dial cmd works!

[Ma Zhiyong]

Hi, I just set two asterisk connect with iax2 trunk.

B server 
[user1]
type=user
trunk=yes
context=from-trunk
username=user1
auth=plaintext
secret=passwd
notransfer=yes

A server 
register => user1:passwd at x.x.x.x

I notice  on A's CLI, it  shows "Registration of 'user1' rejected: 'Registration Refused' from: 'x.x.x.x'". I also use "iax2 show registry" it say "Unregistered".

But when I use dial cmd: Dial(iax2/user1:passwd at B/${exten},30,), I can call the extension normally.

What's wrong? Why can't I register to B server?