Free or low costs did/numbers

[cattivello]

greetings,
first I hope I am posting to the correct section.
If not, please, advice me where should I do it.

I need to have 2 numbers from 2 different countries (USA, Hungary) to use in my VOIP phone (is a gigaset). I know how to do that (already have 2 other countries on it).
I am searching all over and cant find a number I can purchase or simply have.

I know have 2 subscription for The Netherlands (10 euro/year) and one for Italy (free)
Both can be called from any PSTN or GSM number in the world.

Do you have a suggestion how to have the same for USA and Hungary?
And I need to be able to use my own hardware and have a SIP registration instruction.

Thank you,
Bacco