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Every call in Zelto arrives through one of four ingestion paths. This guide helps you pick the right one and confirm it’s working; each provider’s own page has the click-by-click steps.

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Which integration do I need?

Your stackUseHow calls arrive
VapiNative API keyWebhooks — you paste Zelto’s URL into Vapi
RetellNative API keyWebhooks — you paste Zelto’s URL into Retell
SpeechifyNative API keyPer-agent webhook — you set Zelto’s URL as the agent’s webhook_url
TelnyxNative API keyImport assistants today; forward calls via Custom & other providers for now
LiveKitPush from your workerYour agent forwards each finished session with an API key
ElevenLabsNative API keyPost-call webhook you add in ElevenLabs (signed), with hourly pull as backup
Anything else — Bland, Pipecat, in-houseCustom & other providersYou POST calls to /webhooks/calls
If you run on Vapi or Retell, use the native integration — you connect with an API key, paste Zelto’s webhook URL into the provider, and recordings are fetched for you. LiveKit and the custom path are push-based: nothing pulls calls for you, so your code forwards each finished call with an org API key. All four land in the same conversations list, tagged with the originating agent.

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What “connected” looks like

However a call arrives, the path through Zelto is the same:
1

The payload is recorded

Zelto records the raw payload in an append-only log before anything else, so ingestion is replayable and no delivery is lost.
2

A conversation appears

A row shows up in Conversations with the transcript and, when present, the re-hosted recording.
3

Analysis runs

The call is analyzed in the background; findings attach as they surface.

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Verify your first call

Place a test call to your agent, then:
  1. Open Conversations and confirm the call is listed with its transcript.
  2. Check the agent’s Connections card — it shows whether a webhook has arrived recently, the fastest “is anything getting through?” signal.
That round trip — call placed, webhook arrives, conversation visible — means the integration is live.

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Troubleshoot a missing call

If a call doesn’t appear in Conversations, where you look depends on how it arrives:
  • Vapi or Retell — open the agent and check its Connections card. A recent “last call received” time means calls are flowing; “no recent calls” means nothing has arrived lately; “last webhook errored” means the most recent delivery reached Zelto but couldn’t be turned into a conversation. No calls at all? Re-check the webhook URL in the provider, and that the provider is actually sending events.
  • LiveKit or a custom stack — check the HTTP response your code got back from /webhooks/calls. A { "received": true } body means Zelto accepted the call; a 4xx returns the reason in the body — a missing or wrong X-Zelto-Provider header, a failed field validation, or an invalid API key. Fix the payload against the canonical fields in Custom & other providers, then re-send.