Try to always choose the closest server to your physical location, to try to keep latency at the minimum.
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For numbers in North America and Central America: sip:inbound-us-east.toky.co:5060
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South America: sip:inbound-sa-east.toky.co:5060
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Europe and Africa: sip:inbound-eu-west.toky.co:5060
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Western Asia: sip:inbound-eu-west.toky.co:5060
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Central Asia and Asia Pacific region: sip:inbound-ap-sg.toky.co:5060
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Australia and New Zealand: sip:inbound-ap-au.toky.co:5060