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Streaming Call Audio with SignalWire’s Compatibility API
Whether you're building real-time transcription tools, custom call recording workflows, or just need more control over your audio streams, SignalWire’s Compatibility API makes it simple.
In this video, André walks through how to:
Set up a publicly available SignalWire number
Forward incoming calls to a personal line while simultaneously streaming audio to a server
Use a WebSocket server to receive audio streams in real time
Separate inbound and outbound tracks and save them as a WAV file locally
Use event messages like
start,media, andstopto trigger file creation
It’s a hands-on, code-focused tutorial using Node.js, but the concept works with any language that can handle WebSockets. If you're looking to take it one step further and stream live audio to services like Deepgram, check out our companion blog, "Transcribing SignalWire Voice Calls with Deepgram".
What is RCS messaging?
Rich Communication Services (RCS) is the next generation of mobile messaging, designed to replace SMS and MMS. It supports high-quality images and video, verified sender identities, read receipts, typing indicators, and interactive elements like carousels and quick replies, all within the phone's native messaging app.
What is RCS Business Messaging (RBM)?
RCS Business Messaging (RBM) applies RCS capabilities to brand-to-consumer communication. It lets businesses message customers from a verified brand identity instead of a phone number, share rich media and documents, offer quick replies and CTAs, and handle actions like appointment confirmations and payments without the customer leaving the chat.
Is RCS replacing SMS?
RCS is positioned as the successor to SMS, but the transition is gradual. Businesses should adopt RCS where supported while keeping SMS and MMS as fallback channels for devices and networks that don't yet support it.
Does iPhone support RCS?
Yes. Apple added RCS support starting with iOS 18, with RCS Business Messaging support arriving in iOS 18.1. Combined with existing Android support, this brings RCS to the large majority of smartphones in the US.
Is RCS more effective than SMS for customer engagement?
Yes. Nearly 80% of consumers say RCS makes them more likely to engage with a brand, and RCS campaigns can achieve click-through rates up to 7x higher than SMS thanks to rich media, interactivity, and verified sender trust.
ow do businesses start sending RCS messages?
Businesses must first register an RCS agent, an approval process involving Google, aggregators, and mobile operators. From there, they can define use cases like marketing, customer service, or appointment reminders. SignalWire guides businesses through registration and campaign planning.
Which industries benefit most from RCS?
Retail, finance, and healthcare are early leaders. Retailers use RCS for in-chat purchases and product carousels, financial institutions use it for secure verified messaging and account alerts, and healthcare providers use it for appointment scheduling and reminders.
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