question

I work as an independent sales contractor in the United States, I work full time and make over 100 calls a day. I have an american ringcentral phone number and only make calls and sales to other american residents, but I was wondering if ring central would still work if I traveled to another country and still used my american number to make calls to american clients/numbers? Will it still be as if I'm in america or will I have to get a new number/pay for international calling?