How to find the dialed number

Hi Guys,

I've successfully got inbound call call connected events coming through to my WebHook when a call is picked up by an extension which is fantastic.

I also need to know though what the number is that the caller actually dialled initially (not the extension but the actual original calling number) ... how do I find that out? It isn't in the json blob that the WebHook receives.

Thanks for the help