Need experiences with QoS Europe to South America

Hi all,
I need to check if it is possible to have an adecuate call (with low lattency < 150ms or similar) from Europe (Switzerland) to South America.

Has anyone had a similar experience?

Only a single call is needed at the same time.

We have 512/128 on each end but may increase it if needed, with public IP’s.

I’ll appreciate if someone could share a couple minutes of conversation so that I could set up my SIPphone and register on their server or the other way arround, I set up an account for a SIP phone on my asterisk and let someone else on the old continent to log into this server, to check what the communication is like.