Miracast uses a direct connection and does not use your wireless infrastructure, so it will work fine for guests.
AirPlay is a bit more tricky, and you will need to work with your wifi implementation in order to allow guests to "see" it. (just like a regular Apple TV).
Hello @QuentinDavid,
welcome to the Polycom Community.
The community's VoIP FAQ contains this post here:
Jan 03, 2013 Question: How can I request a change to the current Polycom SIP / UC Software?
Resolution: Please check => here <=
This needs to be a feature request.
Please ensure to provide some feedback if this reply has helped you so other users can profit from your experience.
Best Regards
Steffen Baier
Polycom Global Services