Blocking on IAX2

Hello there,

            I have been using IAX2 to connect another asterisk  server. Until yesterday it worked fine. But for some unknown reasons it had stopped working. I want to know if my provider have blocked the IAX2 protocol. Also how can i be sure whether my provider have blocked it or not ?

If they have blocked the IAX2 port you could try changing the port on both sides and see if it works. If any of the asterisk boxes is behind NAT it could be a problem with the router configuration.