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Audio instant messaging is near-real-time messaging in which someone sends a spoken or recorded audio message to one or more recipients. Instant messaging is not limited to text: the message can be audio, and the recipient can listen to it after it arrives.
What makes audio messaging “instant messaging”?
The defining feature is near-real-time message exchange, not the use of a keyboard or text. The IETF’s RFC 3428 describes instant messaging as near-real-time exchange of content. It notes that the content is generally short text but does not have to be, and that messages can carry content in MIME body parts. RFC 3428 defines a SIP protocol extension for this exchange; it is not a specification for every feature in modern messaging apps.
Audio instant messaging therefore describes the message’s form and delivery pattern: a person composes or records speech, sends it as a message, and the recipient receives it for playback. RFC 3994 makes the composition point explicit: “By definition, instant messaging (IM) is message based: A user composes a message by, for example, typing, speaking, or recording a video clip.” The RFC also recognizes voice as a possible message type. RFC 3994 addresses composition indications—signals that someone is composing a message—not a universal audio-message protocol.
How is a recorded audio message different from push-to-talk?
A recorded audio message is sent for the recipient to play later, much like a voice note. Live push-to-talk is closer to a walkie-talkie: audio is handled during an ongoing session. Apple’s Push to Talk framework describes controls and audio handling for that kind of session, making it a useful contrast rather than a synonym for recorded messaging. Apple’s Push to Talk documentation
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- Recorded message: The sender records and sends audio; the recipient receives it and listens through the messaging service.
- Live push-to-talk: Participants transmit and handle audio as part of an active session.
The distinction matters because a service can support one mode without supporting the other. A feature’s name alone does not establish how it delivers audio; check whether it sends a playable message or connects participants in a live session.
How do standards describe audio messaging?
RCS audio messaging
The GSMA’s RCC.62 v3.0, published in March 2017, describes Audio Messaging as using spoken voice to convey a message that its recipient can listen to through an RCS interface. This is an RCS-specific product definition, not a universal definition for every messaging service. GSMA RCC.62 v3.0
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Messaging service functions
ISO/IEC 29341-26-12:2017 describes a UPnP telephony Messaging service. Its page-mode functions include notification, reading, sending, and deleting messages; its session-mode functions include notification, retrieval, sending, and session management. The standard describes service behavior rather than requiring a particular consumer device or defining one mandatory audio-messaging product. ISO reports that this edition was reviewed and confirmed in 2025 and remains current. ISO/IEC 29341-26-12:2017
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Services do not necessarily implement the same feature set. To understand what a particular feature does, check:
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- Whether it sends a recorded clip for later playback or transmits audio in a live session.
- Whether messages are delivered individually or within a session.
- How recipients are notified and how they retrieve or play the audio.
There is no single protocol definition established for the phrase “audio instant messaging.” It is a practical description of instant messaging in which the composed message is spoken or recorded rather than typed.
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