docs.vapi.ai

# Vapi ## Docs - [Introduction](https://docs.vapi.ai/quickstart/introduction.mdx): Build voice AI agents that can make and receive phone calls - [Phone calls](https://docs.vapi.ai/quickstart/phone.mdx): Learn to make your first phone call with a voice agent - [Web calls](https://docs.vapi.ai/quickstart/web.mdx): Build voice interfaces and backend integrations using Vapi's Web and Server SDKs - [Guides](https://docs.vapi.ai/guides.mdx): Explore real-world, cloneable examples to build voice agents with Assistants and Squads - [Composer](https://docs.vapi.ai/composer.mdx): Build and configure voice AI agents through natural conversation - [Vapi CLI](https://docs.vapi.ai/cli.mdx): Command-line interface for building voice AI applications faster - [Assistants quickstart](https://docs.vapi.ai/assistants/quickstart.mdx): Build your first assistant and make a phone call in minutes - [Transient vs permanent configurations](https://docs.vapi.ai/assistants/concepts/transient-vs-permanent-configurations.mdx): Learn to choose between inline and stored assistant configurations - [Variables](https://docs.vapi.ai/assistants/dynamic-variables.mdx): Personalize assistant messages with dynamic and default variables - [Multilingual support](https://docs.vapi.ai/customization/multilingual.mdx): Configure multilingual voice AI agents with automatic language detection, cross-language conversation, and localized voices - [Personalization with user information](https://docs.vapi.ai/assistants/personalization.mdx): Add customer-specific information to your voice assistant conversations - [Voice formatting plan](https://docs.vapi.ai/assistants/voice-formatting-plan.mdx): Format LLM output for natural-sounding speech - [Flush syntax](https://docs.vapi.ai/assistants/flush-syntax.mdx): Force immediate voice transmission with VAPI's flush syntax for real-time interactions - [Background messages](https://docs.vapi.ai/assistants/background-messages.mdx): Silently update chat history with backgrou