Use M-J SIP account as my PSTN for an Asterisk test server

[reelbigfish]

I have a MJ and a working Astrisk server with some sip phones. I'd like to use the MJ account as PSTN provider for my Asterisk test box.

I've captured a Sniff of MJ but I'm not sure what I need and how to find it.

Any help will be greatly appreciated. Thanks