Asterisk itself as an IAX2 client?

I understand that it is possible to configure Asterisk itself as a SIP client.

Along these lines…
Is it also possible to configure Asterisk itself as an IAX2 client ?
(Not an IAX2 trunk.)

I have been looking for documentaion that shows:
a. The settings for making one Asterisk the IAX2 server.
b. The settings for making another Asterisk the IAX2 client.

Where can I find more information on this?