While testing this service, though, I’ve come across a show-stopper: sip to sip calls are limited to 3 minutes. I’ve also encountered the same limit calling from a google talk to a gizmo5 jabber account, jabber to jabber.

To get past the 3 minute limit, the user has to subscribe to a premium service that costs $5 a month.

The faq pages on the Talkonaut site indicate that such calls are unrestricted. I assume that Talkonaut has recently changed its policy, and that the faq has not been updated.