Up to 8 attachments (including images) can be used with a maximum of 1.0 MB each and 10.5 MB total.
There is an answer to same kind of question by him. Putting here as a reference:
Up to 10 attachments (including images) can be used with a maximum of 1.0 MB each and 10.5 MB total.
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Pull call recordings....
I have used https://service.ringcentral.com/faxapi.asp. It raised upgrade your browser error. Couldn't send the fax viia API in C#
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need extensionNumber returned in active-calls