Asterisk Configuration

Hi,

I had installed Asterisk 1.4.4 and everything seem to be working. I had signed up for a SIP account and wanted to test it on the Asterisk machine.

I want to configure the SIP to forward the calls to an external phone number and to play a voice message during a certain period of time.

Which are the conf files I have to configure and how? Is this you meant by Dialplan?

Thanks

Yes, u have to do with dialplan(extension.conf)