The nurse went on to say the duchess had had an uneventful night, as another radio employee pretended to be a dog yapping in the background. The alleged queen and prince then talked about traveling to the London hospital to check in on the patient, who is married to the queen's grandson, Prince William.
The hospital said it supported Saldanha in the aftermath of the call and that its phone protocols were under review.
The Australian station 2DayFM placed the recording of the conversation on its website but later said it was sorry. Australian radio personalities Mel Greig and Michael Christian apologized for the hoax.
"We were very surprised that our call was put through. We thought we'd be hung up on as soon as they heard our terrible accents," they said in a joint statement with the station at the time. "We're very sorry if we've caused any issues and we're glad to hear that Kate is doing well."
However, the disc jockeys also described the call as the "easiest prank call ever made," and promoted it through the station's website and social media accounts.
The Sydney-based 2Day FM continued promote its prank call on air early Saturday morning. It described the hoax as "the prank call the world is talking about" before playing clips of news programs reporting on the original call.
Christian's Twitter account has since been taken down.
Officials from St. James's Palace have said the duchess is not yet 12 weeks pregnant. The child would be the first for her and Prince William and become third in line to the British throne, after Charles and William.