Need a Twilio Expert to add real-time audio streaming while a phone call is made

Many prank phone call apps allow you to listen live as a call is made to the prank recipient. For instance, the Ownage Pranks app at [login to view URL] allows you to listen live while the prank call is being made (you can download it for Android/Apple and it will give you 1 free call which you can test by calling your own phone). We know how to make phone calls using Twilio Twiml Dial and PHP (fairly simple) but are looking for a Twilio expert who can add the ability to also listen in real-time through (laptop/smartphone) speaker as the phone call is made - just like ownage pranks. Not sure if we need to use Stream/Conference functions, but invoking the call from a PHP/browser page, so it will involve Twilio PHP library (no need for Android/Iphone) as this should be able to work in any webpage/webapp. No need to record (which is very easy) - just ability to listen via speaker as the phone call is made to the prank recipient. If you are a Twilio expert, then this should be fairly straightforward - we also have other interesting projects for the right person.