Victoria's embattled triple-zero call service was plunged into further chaos overnight after a technical error crashed the system and caused another ambulance "code red".
Up to 75 patients were left waiting for paramedics when the computer-aided dispatch (CAD) system suffered an IT glitch, ambulance union secretary Danny Hill said.
"They've called in, they require an ambulance, yet there are none available," he told Melbourne radio 3AW on Friday.
