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AUDIO
SLN Converter
Convert SLN files with ConverterHQ using workflows tuned for audio compatibility, predictable output, and practical downstream use.
Quality and compatibility profile
Core technical and historical facts used for conversion quality, compatibility decisions, and SEO uniqueness.
| Feature | Fact sheet |
|---|---|
| Category | AUDIO |
| Extensions | sln, raw |
| MIME types | audio/x-sln |
| Created | 1999 |
| Inventor | Digium (Mark Spencer) |
| Status | active |
| Compression type | uncompressed PCM |
| Channel Modes | mono, stereo |
| Sample Rate Support | 44.1kHz, 48kHz |
| Lossless | ✅ |
| Sample Rate | 8000 Hz |
| Bit Depth | 16 |
| Telephony Format | ✅ |
| Transparency support | ❌ |
| Animation support | ❌ |
| Layer support | ❌ |
| Vector scaling | ❌ |
| Reflowable text | ❌ |
| Multitrack content | ❌ |
| Camera raw data | ❌ |
| HDR content | ❌ |
| Structured data | ❌ |
| Streaming delivery | ✅ |
About this format
SLN format context
Format: SLN
Overview
SLN matters because Asterisk uses raw 16-bit signed linear audio files as practical working assets for prompts, voicemail, and telephony media handling across several sample-rate variants.
PBX and telephony platforms needed a straightforward raw-audio format for reading, writing, and resampling prompt or recording assets inside system workflows.
SLN still appears in Asterisk deployments, voice-prompt libraries, and telephony migration tasks where files need to remain compatible with PBX media modules.
SLN is closely associated with Asterisk PBX / Sangoma Technologies.
SLN is usually selected for workflows that center on capture ingest, editing and mastering, streaming or playback delivery.
Typical Workflows
- capture ingest
- editing and mastering
- streaming or playback delivery
Common Software
- Asterisk
- SoX
- telephony prompt toolchains
Strengths
- Simple raw representation aligned with telephony workflows.
- Explicit sample-rate variants used operationally by Asterisk.
- Useful in prompt and voicemail preparation pipelines.
Limitations
- Not a general-purpose consumer exchange format.
- Requires workflow context to interpret sample-rate-specific extensions correctly.
Related Formats
- WAV
- VOC
- AU
Interesting Context
Telephony systems often value simple, predictable raw media assets over consumer-facing container polish, which is why formats like SLN remain operationally relevant long after their user-facing visibility disappears.
SLN belongs to Asterisk, FreePBX, IVR builders, voicemail systems, call-center tooling, and telephony automation pipelines where prompt playback and transcoding behavior must remain simple and deterministic.
Its ecosystem is narrow but deeply practical in PBX deployments.
Status: active. Introduced: 1999. Invented by: Digium (Mark Spencer). Stewarded by: Asterisk PBX / Sangoma Technologies.
How SLN fits into workflows
Workflow role: SLN
Convert to SLN when preparing prompts, voicemail assets, on-hold audio, or other sound files for Asterisk-style telephony systems that expect raw signed-linear input.
It is the right target when PBX compatibility and predictable call-audio handling matter more than metadata or ordinary media-player support.
History of SLN
Format history: SLN
Telephony systems often value simple, predictable raw media assets over consumer-facing container polish, which is why formats like SLN remain operationally relevant long after their user-facing visibility disappears.
Original problem: PBX and telephony platforms needed a straightforward raw-audio format for reading, writing, and resampling prompt or recording assets inside system workflows.
Why SLN still matters
Current role: SLN
SLN matters because Asterisk uses raw 16-bit signed linear audio files as practical working assets for prompts, voicemail, and telephony media handling across several sample-rate variants.
Modern role: SLN still appears in Asterisk deployments, voice-prompt libraries, and telephony migration tasks where files need to remain compatible with PBX media modules.
When to use SLN
- capture ingest
- editing and mastering
- streaming or playback delivery
Advantages of SLN
- Simple raw representation aligned with telephony workflows.
- Explicit sample-rate variants used operationally by Asterisk.
- Useful in prompt and voicemail preparation pipelines.
Limitations of SLN
- Not a general-purpose consumer exchange format.
- Requires workflow context to interpret sample-rate-specific extensions correctly.
Formats related to SLN
SLN technical profile
| Feature | Fact sheet |
|---|---|
| Category | audio |
| Extensions | .sln, .raw |
| MIME types | audio/x-sln |
| Created year | 1999 |
| Inventor | Digium (Mark Spencer) |
| Status | active |
| channel_modes | mono, stereo |
| sample_rate_support | 44.1kHz, 48kHz |
| compression_type | uncompressed PCM |
| lossless | True |
| sample_rate | 8000 Hz |
| bit_depth | 16 |
| telephony_format | True |
| supports_transparency | False |
| supports_animation | False |
| supports_layers | False |
| supports_vector_scaling | False |
| supports_reflowable_text | False |
| supports_multitrack | False |
| camera_raw | False |
| hdr_capable | False |
| structured_data_capable | False |
| streaming_ready | True |
| sources | {'url': 'https://docs.asterisk.org/Operation/Asterisk-Audio-and-Video-Capabilities/', 'title': 'Signed Linear PCM support in Asterisk', 'relevance': 'Official specification', 'source_type': 'official'}, {'url': 'https://docs.asterisk.org/Fundamentals/Asterisk-Architecture/Types-of-Asterisk-Modules/File-Format-Drivers/', 'title': 'Reference Documentation', 'relevance': 'Technical reference', 'source_type': 'reference'} |
SLN quality and compatibility
Format profile: SLN
Size profile: medium. Quality profile: depends. Editability profile: limited. Compatibility profile: broad. Archival profile: moderate. Metadata profile: moderate. Delivery profile: strong. Workflow profile: delivery. Status: active.
Notable capabilities: streaming delivery.
Software that opens SLN
- Asterisk
- SoX
- telephony prompt toolchains
Conversion options
FAQs
Q: What is SLN typically used for?
A:
SLN is commonly used for capture ingest, editing and mastering, streaming or playback delivery.
Q: What are the advantages of SLN?
A:
SLN is broadly compatible across common software.
Q: What should I watch out for when converting SLN?
A:
Check output quality and compatibility on representative sample files.
Sources
Official specification
Technical reference