Detect phone number in Lex/Lambda from a Twilio SMS service

Hi all,

I'm building a chatbot using: Twilio -> Lexv2 -> Lambda

I would like to capture the phone number of the user that is currently texting the bot in order to log information about the interaction along with a couple of other things.

Right now the only request attribute that is coming across in the event is:

"x-amz-lex:channels:platform": "Twilio"

Is there anything I need to enable in order to get the phone number that started the interaction passed through in the request attributes?