Strange delay

Hello all,

I’m using have trixbox installed on the vmware…
I wanted to use an IVR to create an interactive menu. I dial 7777(Simulate Incoming Call) and can hear my welcome message and information about what buttons to push in order to pass into the next level of menu. But, when I try to press that buttons immediately after my message stopped playing I got nothing. I have to wait a little bit(about 5-10 seconds) in order to get that buttons “worked”. Is there any mistake in the configuration files, or hardware problems?
Thanks in advance…