Assistance Needed: Scheduled Calls Not Processing in Batch Campaign

Hello,

We sent a batch of 300 contacts to Vapi. For each contact, Vapi returned a call ID. However, only 85 calls were actually processed.

The remaining 215 calls were put into a scheduled state but did not proceed further. There are no call logs, call attempts, or failure reasons visible for these calls in the call logs.

Could you please help us understand:

Why these 215 calls were scheduled but not executed

Where scheduled calls can be checked (e.g. schedule logs, queue view, or any other endpoint), as we currently do not see anything related to these calls in the call logs

What happens internally to calls that remain in a scheduled state (timeouts, retries, expiry, etc.)

Whether there are any internal limits, throttling, or queue constraints that could cause this behavior

What needs to be done on our side to reliably process large batches (e.g. 300 contacts) without calls getting stuck without logs

We would appreciate any guidance or documentation references on how scheduling and large batch handling works in Vapi.
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