Don't use the "conversationId": 6271905464763260000. It is deprecated and present only for legacy purpose. Use the "id" in the "conversation" object instead.
Sorry, I should have mentioned that I tried that too and is also returns zero results.
Are you saying that If I use the ID in the conversation object as an argument in the API call for Conversation ID I should return the records from that conversation? It also returns zero record results.
Using the RingCentral Phone for Desktop, you can dial or receive test calls, send and receive test SMS or Fax messages in your sandbox environment.
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