A connection to an INX merely provides you with the opportunity to exchange traffic with the other networks connected to the same INX. Exactly what traffic you exchange depends on the arrangements you make with those networks. Some of the other participants may be willing to provide you with an international transit service. There is nothing in the INX policies preventing a member from offering such a service, but it is not a service that the INX itself provides.
In general, peering does *not* replace the need for you to have a transit provider; it merely facilitates the exchange of traffic between you, and other networks that are connected to the same Internet exchange.
