Discovery on large group calls?

I find it difficult to run thorough discovery on initial calls where there are 7+ people attending the call, both because in such large groups tend to be reluctant to respond as well as due to time constraints of getting to every single person.

I'm curious on best practices here, ensuring you get enough information out of the call while also still saving time for a demo. Any advice?

For further context, our initial calls are usually 45 minutes for discovery/intro and demo. Typical SaaS sales. Would love to hear your thoughts