Media stream question

Hi.

Let we connect two SIP channels with different providers from our asterisk, e.g. SIP/xxxxx@tario and SIP/yyyyy@tario

The question is: when xxxxx and yyyyy start talking - does the media stream go directly between them (xxxxx<->yyyyy) or via asterisk like xxxxx<->asterisk<->yyyyy? Or smth else?

Thank you.