Linksys PAP2 can't make telephone to computer calls.

cirrus18

Linksys PAP2 can't make telephone to computer calls.

I have a couple of friends living overseas who call me on my Voipcheap telephone when my computer is not switched on. It been working okay for a year or more.
It's stopped working now, they can't call me, and I can't call them when utilising telephone to computer/computer to telephone calls.

If they call me, or I call them, using our computers, it works perfectly. So it must have something to do with the Linksys PAP2 setup. What is strange is that I can use Voipcheap to call normal landline numbers and when I go into the Linksys setup (without the Voipcheap programme running on my computer) it shows, Registration State:Online. But they on the other hand get the message that I am not online. When I tried to call them I just got an unobtainable tone.

Now, I don't know if this just coincidence or not and it has all happened since I changed over to AOL and started using their Router .

Any help here would be most appreciated.