ResponseBody responseBody = restClient.post("/restapi/v1.0/account/~/extension/~/fax", requestBody);
And in that JSON response there's a "uri" field of the form (edited):
"uri" : "h ttps://platform.devtest.ringcentral.com/restapi/v1.0/account/<ACCOUNT>/extension/<EXTENSION>/message-store/<MESSAGE_ID>"
What I'm not clear on is that exact API call that I need to make and how I make use of the URI. Can anyone supply some sample code? Thanks in advance... :-)