asterisk users - Jun 2004 - Accepting SIP calls from unregistered gateways

Hi,
Is there a way to accept SIP calls from unregistered gateways?
autocreatpeer=yes seems to disable checking credentials but the originating
gateway is still required to register itself with a username and password (which
can be anything since it won't check it).
I like to be able to receive the call from any gateway without them having to
register even, just like a Cisco gateway that you can terminate a call from
clients who are not registered.  Is such thing possible with Asterisk?

Best regards,

Axel
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