People have been urged to only call 999 in urgent situations after the ambulance service experienced telephone issues.
The North East Ambulance Service's chief operating officer Paul Liversidge said it the problems centred around the lines at its base in Newcastle.
He said: “We’re experiencing telephony issues at our Bernicia House site this morning.
“We have resilient contingency plans in place for incidents like this to minimise the impact to patients. “Our plans are implemented immediately during an event like this. They involve back up support at our second control room as well as telephony support from neighbouring ambulance services where necessary.
“We are working closely with BT to resolve the issue as soon as possible.
“As always, please only call 999 in the case of an emergency.”