Eco Cast lets you invite actors to submit a video audition, rather than come to you in person. Then you can review their video auditions at your convenience, along with any auditions you have recorded yourself. This service is free to the Casting Director.
When you receive submissions on a breakdown, you may choose to select some actors for in-person auditions and invite others to submit via Eco Cast.
See:
Sending an Eco Cast Invitation
Responding to an Eco Cast invitation