Starts an agent call.

Agent must be active and use an active LLM, and channel must support agent calls, i.e. support AI agents.

By default, calls respect quiet hours restrictions (weekdays 10 PM - 7 AM, no calls on weekends) and business hours, calculated using the channel's timezone (defaults to "America/Los_Angeles"). When restrictions apply, calls are automatically scheduled for the next available time. Use the bypass_quiet_hours parameter to bypass these restrictions, but be careful as this may result in contacting people at inappropriate times.

Accepts an optional schedule_at parameter to schedule the call instead of placing it immediately, but attention, even when scheduled quiet hours restrictions still apply, unless the bypass_quiet_hours parameter is used. Also, the schedule call might be delayed depending on the organization's ongoing call volume, although it's prioritized over non scheduled calls.