Ofcom said such problems were often caused by answer machine detection (AMD) technology.
Sometimes the software mistakenly identifies an answer machine or voicemail, and terminates the call, even though it has been answered by a human being.
Ms Cole said the victim was "beside herself with worry and terrified" even before matters escalated with a message left three days later on her answer machine.
Ross, 48, was suspended for three months last year for his part in the Radio 2 row over lewd messages he and comedian Russell Brand left on actor Andrew Sachs' answer machine.
One angry women jumped out of her car to tell us how she and her daughter had suddenly lost their jobs - her daughter found out by a telephone message left on her answer machine.
When we got it right, the machine would answer with sharp hisses and beeps.
They dropped again in the evening as Prof Randell had arranged for one of Colossus's creators, Allen "Doc" Coombs, to attend and answer questions about the machine and what it did.
It would be a machine that could answer that question, really.
The businesspeople who know what questions would be the most valuable to answer have no idea of what machine data is, let alone what it can tell them.
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The answer is part man, part machine.
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The match was held in New York City and was billed as the contest that would ultimately answer the big question: what is the most intelligent thinking machine on the planet?
Their answer has been to produce a poor man's computor, a machine that calculates electronically, but has neither the ability to store data nor the power to plan its own operations that are peculiar to a full-sized electronic brain.
These men have only very light weapons - machine-guns and rocket propelled grenades - and they have no answer when government forces decide to use heavy weapons, as they appear to have done overnight.
The answer is... the IMF seem to have put their UK fiscal advice-making machine on hold.
The answer lies in a huge yet barely acknowledged shift of power within government: from the civil-service machine to ministerial personal advisers and spin-doctors.
The answer will only become clear in coming quarters as U.S. consumers decide whether to install a SodaStream machine next to their Keurig.
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