ENUM to own asterisk server

When the ENUM server replies with an extension on my own Asterisk server, the call does not complete. (My IP address is 192.168.125.209)

[2012-07-20 16:12:22] VERBOSE[9057] app_dial.c: – Called sip/[email protected]
[2012-07-20 16:12:22] VERBOSE[9057] app_dial.c: – SIP/192.168.125.209-0000000f is circuit-busy

What may the cause be?

Thanks!

Centos 6.3 + Apache 2.2.15 + MySQL 5.1.61 + PHP 5.3.3 + PhpMyAdmin 3.5.2 + Asterisk 1.8.13.1 + FreePBX 2.10.1.1

nano /etc/asterisk/enum.conf

; ENUM Configuration for resolving phone numbers over DNS
;
; Sample config for Asterisk
;
[general]
;
; The search list for domains may be customized. Domains are searched
; in the order they are listed here.
;
search => e164.org
search => e164.arpa

Also in freepbx add in inbound route with your enum number to the extension you want to ring