# Voice Calling overview (/en/realtime-media/voice)

> For AI agents: see the complete documentation index at [llms.txt](/llms.txt).

Agora's Voice Calling API enables crystal-clear, real-time voice communication across any device and platform. Powered by advanced audio codecs and network optimization, it ensures ultra-low latency and high-quality performance even in low-bandwidth environments. Ideal for social audio, customer support, gaming, and other real-time voice applications, this solution allows you to integrate scalable and secure voice calling capabilities into your products.

Extend Agora's Voice SDK with capabilities such as recording, transcription, and moderation, or leverage the Extensions Marketplace to enable AI-powered features like noise cancellation, voice effects, and more.

## Start building [#start-building]

<Cards>
  <Card title="SDK quickstart" href="quickstart.mdx" description="Create a basic Voice Calling app and join your first channel." />

  <Card title="Download SDKs" href="/en/api-reference/sdks?product=voice" description="Get the latest Voice SDK package for your target platform." />

  <Card title="Authentication" href="build/set-up-token-authentication/use-tokens.mdx" description="Protect channels with tokens before moving to production." />

  <Card title="API reference" href="/en/api-reference/api-ref/rtc" description="Explore RTC API references for supported Voice SDK platforms." />

  <Card title="Samples" href="https://github.com/AgoraIO/API-Examples" description="Browse open-source sample projects for common Voice SDK workflows." />
</Cards>

## Product Features [#product-features]

<CardGrid>
  <FeatureCard title="AI-powered audio enhancement">
    Support for 3D spatial audio, AI noise suppression, active speaker recognition, and gain control to provide an immersive audio experience.
  </FeatureCard>

  <FeatureCard title="Clear audio">
    48 kHz sampling rate with full-sound bandwidth capture provides natural audio reproduction and ensures clear sound during calls.
  </FeatureCard>

  <FeatureCard title="Voice effects">
    Add audio effects ranging from sound mixing and reverb to fun voice filters.
  </FeatureCard>

  <FeatureCard title="Multiple audio tracks">
    Publish one or more audio tracks to one or more channels from a single instance, with support for multi-channel microphones.
  </FeatureCard>

  <FeatureCard title="Recording">
    Record live audio calls in the cloud or on premises and control the audio format, storage path, and voice quality.
  </FeatureCard>

  <FeatureCard title="Global coverage">
    Agora’s Software-Defined Real-Time Network (SDRTN®) supports voice users in over 200 countries and regions.
  </FeatureCard>
</CardGrid>