Vapi rebuilds Campaigns for batch outbound calling at 10,000 contacts

Vapi launched a rebuilt version of Campaigns, its batch outbound calling product, which now runs on a standalone durable workflow engine separate from the call queue. Each campaign can take up to 10,000 contacts plus an assistant or squad and a phone number, with dialing confined to a set window, per-contact variables in the assistant prompt, and a pre-dial webhook that skips contacts who already converted. Vapi says campaign state persists outside any single process, concurrency runs as a sliding window rather than a batch, and every state change appends an immutable event so progress and audit trails cannot drift.