use obi from China to call another obi in USA

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minzhong2001:
I have used 2 obi devices in USA from many years. The 2 obi devices can be used to call each others by speed dialing (e.g. pressing 2#, wait for options, then dial "1").  My question is whether one of the devices be used in China to call the another phone in USA. If yes, do I need to change the settings?

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