app_dial.c:787 wait_for_answer: Unable to forward voice or d

Hi,

I have successfully installed asterisk PBX.

[color=#FF4000]app_dial.c:787 wait_for_answer: Unable to forward voice or dtmf[/color]

When i dial a number from my softphone i am getting this in my console.

Does anybody why this error is coming continues ?

What is this error means ?