OK, maybe I'm nuts!
You used the term IPSEC. This to me means that you are using a VPN. If yes, how come the pictures you sent have so many hops? Maybe you are using PP outside/beside the router? Last time I used PP in this way I had 3 hops because I put my laptop on the voice network. Even though there may have been many hops to get to the other end, PP could only see three. The gateway, the router at the other end, and my voice card.

Also, what gear are you using? FXO/FXS are terms used to define analog sets over IP...

Dave M