Video or telephone visits with doctors — the practice known as telemedicine — have survived one of their biggest legal challenges yet in Texas, but hurdles remain in Arkansas and some other states. The challenges come as telemedicine is gaining widespread support among major employers and many consumers. A federal judge ruled late last week that a Texas Medical Board rule that prohibited doctors from diagnosing patients over the phone was likely anti-competitive and blocked the board from enforcing it. The rule was set to take effect Wednesday.