Update BT engineers are still working flat out to solve a major problem after part of BT's network fell over at around 10:30 GMT this morning. Details are still sketchy, but it's understood that the failure affects part of BT's 0800, 0845 and 0345 platform of numbers, which is currently running at between 30 and 50 per cent capacity. These local call rate numbers are used by a number of different operations including ISPs and call centres. The problem causes heavy congestion in parts while other areas appear unscathed. A spokesman for BT said that engineers still didn't know what had caused the problem. As of 15:20 GMT there was no timetable for the restoration of the service. Earlier today a BT spokesman said: "We don't think it's a complete network failure, we think it is just affecting capacity. "Some calls are still getting through," he said. A railway information hotline is believed to be one of the services hit. A bank call centre is also believed to be out of operation. One Register reader talked of a "massive internal failure" although the scale of the problem is still not known. Telecoms watchdog, OFTEL, said it had received no complaints from customers about any deterioration in service. ®