Good God, would they be able to recognize her voice?

She was the last person he'd expected to hear from, still he recognized her voice at once.

Mark recognized his mother's voice, before he turned to see her face.

For a moment he did not recognize his own voice.

He heard his name but could not recognize her voice.

For a moment she didn't recognize the voice or face.

She did not recognize the voice on the other end of the line.

Now the boys could see him, but they had already recognized his voice.

He recognized the voice, saw the man who was holding him up.

It took a moment for me to recognize the voice.