Retell AI

• Create phone callHave a Retell AI voice agent call a phone number. The call starts straight away; read its transcript and analysis with Get call once it has ended. Calls are billed by Retell.
• Create web callStart a Retell AI call that someone joins from a web page, and get the access token your page connects with. Nobody is dialed, and the token expires if it isn't used.
• Get callFetch a Retell AI call: its status, transcript, recording, cost and Retell's analysis, such as its summary and whether it succeeded. The analysis arrives shortly after the call ends.
• List callsList Retell AI calls, newest first, optionally only one agent's, only some statuses or directions, one number's, one batch's, or those that started in a time range.
• Update callChange an ended Retell AI call's metadata, how much of it Retell keeps, or its custom attributes. Retell only updates calls that have ended.
• End callHang up a Retell AI call that is in progress.
• Delete callDelete a Retell AI call and everything Retell stored about it: its transcript, recording and analysis. This can't be undone. A call still in progress can't be deleted, and nor can a web call nobody joined until Retell gives up on it, 5 minutes after it was created.
• Create batch callHave a Retell AI voice agent call a list of numbers, now or at a set time, only within the calling hours you choose. Each recipient can carry its own dynamic variables.
• Send SMSHave a Retell AI chat agent text a phone number. The agent writes the first message from its prompt and answers replies. The From number must have SMS enabled in Retell.
• Start chatOpen a text conversation with a Retell AI chat agent. Send it messages with Send chat message, and end it with End chat.
• Send chat messageSend a message in a Retell AI chat and get the agent's answer.
• Get chatFetch a Retell AI chat or SMS conversation: its status, transcript, cost and Retell's analysis once it has ended.
• List chatsList Retell AI chats and SMS conversations, newest first, optionally only one agent's, only some statuses or types, or those that started in a time range.
• End chatEnd a Retell AI chat. Retell then analyzes it, and Get chat returns the analysis.
• Create voice agentCreate a Retell AI voice agent from a voice and an existing Response Engine. The Response Engine (a Retell LLM, a conversation flow, or your own custom LLM) must already exist.
• Get voice agentFetch one Retell AI voice agent's configuration: its voice, language, Response Engine, and version.
• List voice agentsList the voice agents on your Retell AI account, most recently modified first. Chat agents are left out.
• Update voice agentChange a Retell AI voice agent's voice, name, language, speech rate, webhook or Response Engine. Only the fields you fill in change. Edits go to the agent's latest draft; a published version can't be changed.
• Publish voice agentPublish a Retell AI voice agent's draft, which fixes it as a version phone numbers and environment tags can point at. Publishes the latest draft unless you name a version.
• Create voice agent draftStart a new draft of a Retell AI voice agent, copied from one of its versions, so you can change it while the published version keeps taking calls.
• Delete voice agentDelete a Retell AI voice agent and all its versions. Its past calls are kept. This can't be undone.
• Create chat agentCreate a Retell AI chat agent, which answers API chats and SMS, from an existing Response Engine such as a Retell LLM.
• List chat agentsList the chat agents on your Retell AI account, most recently modified first. Voice agents are left out.
• Delete chat agentDelete a Retell AI chat agent and all its versions. This can't be undone.
• Create Retell LLMCreate a Retell LLM: the prompt, model and opening line an agent answers with. Use its ID as the Response Engine of a voice or chat agent.
• Get Retell LLMFetch a Retell LLM: its prompt, model, tools and knowledge bases.
• List Retell LLMsList the Retell LLMs on your account, most recently modified first.
• Update Retell LLMChange a Retell LLM's prompt, first message, model or knowledge bases, for example to brief an agent before a campaign. Only the fields you fill in change.
• Delete Retell LLMDelete a Retell LLM and all its versions. Retell refuses while an agent still uses it, unless you force it. This can't be undone.
• Create knowledge baseCreate a Retell AI knowledge base from texts, web pages and files, for agents to look answers up in. Retell reads the sources in the background; Get knowledge base shows when it's done.
• Add knowledge base sourcesAdd texts, web pages or files to a Retell AI knowledge base. Retell reads them in the background.
• Get knowledge baseFetch a Retell AI knowledge base, its sources, and whether Retell has finished reading them.
• List knowledge basesList every knowledge base on your Retell AI account.
• Delete knowledge base sourceRemove one text, web page or file from a Retell AI knowledge base.
• Delete knowledge baseDelete a Retell AI knowledge base and everything in it. This can't be undone.
• List phone numbersList the phone numbers on your Retell AI account and the agents that answer, place calls and text from each.
• Get phone numberFetch one of your Retell AI phone numbers and the agents it uses.
• Update phone numberChoose which Retell AI agents answer calls to a number, place calls from it, and handle its texts, or rename it. Only the fields you fill in change.
• Buy phone numberBuy a new US or Canadian phone number from Retell AI, billed monthly to your Retell account, and choose the agents that use it.
• List voicesList the voices a Retell AI agent can speak with, each with a link to a sample, optionally only one provider's, gender or accent.
• Get voiceFetch one Retell AI voice, with a link to a sample of it.
• Get concurrencySee how many Retell AI calls are running now and how many the account may run at once, for example before starting a batch.

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