VOIP Providers for international calling from USA?

Would anyone in the community like to share 1 or more VOIP providers I can trunk to for a call center that makes most of the calls from the US to international destinations? Wading through the huge amount of providers that want to set a customer up with a complete phone system is getting rather annoying. All I need is pure SIP trunking to international calls with G.711u capabilities, wholesale might be an option since this customer is a call center.

Any thoughts and suggestions would be appreciated.

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Thanks, I’ll check those out!