Yes — there are a few common ways to get real-time call audio streamed to your backend, depending on what kind of calls you’re dealing with and how much control you need.

1) CPaaS providers with media streaming / audio webhook features

These are often the easiest if you’re building on an existing telephony platform.

Common options

• Twilio Media Streams
  Streams live call audio over WebSocket to your server.
• Vonage Voice API / NCCO with websocket audio
• SignalWire
• Plivo (more limited, depending on use case)
• Telnyx Voice API with media/streaming capabilities

Typical pattern

• Call connects through the provider
• Provider forks or streams the audio to your backend
• Your backend receives chunks in near real time, usually over WebSocket
• You can feed that audio into:
  • speech-to-text
  • voice analytics
  • recording
  • AI agents

Pros

• Fast to implement
• Handles PSTN/SIP complexity for you
• Scales better than rolling your own telephony stack

Cons

• Vendor-specific APIs
• Cost per minute can add up
• Some providers stream only one leg or have specific codec/format constraints

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2) SIP / VoIP infrastructure with RTP media relay

If you control the telephony stack directly, you can stream audio from a SIP environment.

Typical components

• Asterisk
• FreeSWITCH
• Kamailio + media server
• RTP proxy / media bridge

How it works

• Calls arrive via SIP
• Media is handled in RTP
• You fork or mirror RTP packets to your backend or to a media processor
• Your backend consumes audio in real time

Pros

• Very flexible
• Good for custom telecom setups
• Can capture both directions of audio exactly as needed

Cons

• More complex infrastructure
• You manage SIP, NAT, codecs, jitter, etc.
• Not as plug-and-play as CPaaS

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3) Contact center / call recording platforms with streaming integrations

Some enterprise call platforms can push live media out to external systems.

Examples

• Contact center platforms with real-time audio APIs
• Some CCaaS products expose live media through integrations or event streams

Pros

• Good if you already use that ecosystem
• May include metadata like agent/customer identity, call state, queue info

Cons

• Often enterprise-priced
• Integration details can be more restrictive

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4) Browser/WebRTC-based calls

If the call is happening in your app/browser, you can capture media directly.

Options

• WebRTC getUserMedia / RTCPeerConnection
• Stream audio from the client to your server via:
  • WebSocket
  • WebRTC data/media pipelines
  • custom upload chunking

Pros

• Direct control over the client audio
• Great for in-app calling

Cons

• Doesn’t solve PSTN phone calls by itself
• Requires app/browser client support

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5) DIY media pipeline using an SBC or audio bridge

If you need full control and are comfortable with infrastructure work:

• Receive call audio on a SIP server
• Bridge to your backend
• Use tools like:
  • GStreamer
  • FFmpeg
  • custom RTP parsing
  • WebSocket streaming

This is usually the most flexible, but also the most engineering-heavy.

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What to choose?

A simple decision guide:

• Want the quickest path for phone calls?
  Use Twilio Media Streams or a similar CPaaS streaming API.

• Need full telecom control and lower vendor lock-in?
  Use Asterisk/FreeSWITCH + RTP/media relay.

• Need browser/app calls only?
  Use WebRTC.

• Already have a contact center platform?
  Check whether it supports live audio streaming/webhooks.

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Important technical considerations

When choosing an API, check:

• Directionality: inbound only, outbound only, or both legs
• Audio format: PCM, μ-law, 8 kHz, 16 kHz, mono/stereo
• Transport: WebSocket, SIP/RTP, HTTP, gRPC
• Latency: true real-time vs near-real-time
• Call metadata: call IDs, timestamps, speaker separation
• Compliance: consent, recording laws, retention, encryption

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If you want a concrete recommendation

For most teams building quickly, I’d suggest:

Twilio Media Streams if you need PSTN call audio streamed to your backend in real time.

If you want, I can also give you:

1. a provider comparison table,
2. a sample architecture, or
3. a code example for receiving live audio streams.