IVR direct dial (enable=extension) not response to external calls

Hi,

PBX Firmware: 6.12.65-24
PBX Service Pack: 1.0.0.0

I did a fresh install FreePBX 6.12.65-24. I am able to call in and call out. Now I want to use IVR. I did the system recording and config IVR with direct dial to Extensions. When I call in I can hear my message. However, when I press any buttons (extension for example 101 or 102) I get no responses. Once the message end I get hang up. What am I missing in the IVR configuration?

In the IVR Ext I put:
1 Ring Group My RG(600)
2 Directory My directory

I also call my SIP providers if they need to do something on their side but they say everything look OK on their side (no help).

Any help would greatly appreciated,
Allen (newbie)