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> 1) fax to 523 760315 (failed for BUSY) > 2) fax to 0131867753 (that went to 523 760315) Seems to me that the call didn't clear properly within the phone network. Check, in particular, that DTR is wired correctly and the modem goes on hook in response to it, although the problem could be further into the phone network. The modem may well be confusing some other tone with BUSY.