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'Telephone-event' in RTP Payload


I've been doing a lot of voice call troubleshooting lately, in particular in the RTP Streams and RTP Stream Analysis areas.

I have found that some calls have 'telephone-event' listed alongside the codec in the payload. (Sorry, I don't have enough points to upload a screenshot of this).

I have also noticed that I can't export the audio stream if the 'telephone-event' is present. When I try, I get the error' Codec is not supported, file is incomplete'. As far as I'm aware my files are not missing anything. If the telephone-event label is not present, I have no difficulties exporting the audio.

I would like to understand what the telephone-event in the payload means. I've tried searching, but I haven't found anything yet. Can anyone help me out?