Dear friend.
Every country or continent have local Post, Telephone, and Telegraphs (PTTs). This entity is need approval voice card interface to work with local PSTN Standards.
If you home in sweden you need fxo card that accomplish with local regulators, in this case is VIC-FXO-EU. In Europe disconect tone and ani information is treated different of EUA or South America.
Best Refards
Joao Medeiros
