There are many delegation models possible:

1. The voice model delegates to one agent.

2. The voice model delegates to multiple agents, and keeps track of tasks.

3. The voice model delegates to an orchestrator agent, which then delegates to sub-agents and keeps track of tasks.

YMMV depending on the exact product experience you care about, because there is a tradeoff between latency and layers of delegation.

Our current implementation is backed by one model, but you can imagine this getting much better with time.