Welltech WG26xx Series V.1.08a - Manual (Page 69)

26xx Technical Manual EN-V108
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3.5.3 Voice File
Voice File Type Voice files type to be uploaded. It could
be greeting or hold Music or Net fail
voice.
Upload File Specify the file path and file name to
upload. Please make sure that the file
format needs to be G.711U, 8K, 8 bits
raw file.