FLAC to SLN Converter
Create Asterisk PBX audio from lossless FLAC files
Best VoIP Quality
Lossless FLAC gives Asterisk SLN files the clearest possible voice prompts.
PBX Native
SLN is what Asterisk expects — produce from lossless FLAC for best results.
Bulk Deployment
Convert all FLAC prompts to SLN at once — deploy a complete Asterisk library.
How to convert FLAC to SLN
Select files from Computer, Google Drive, Dropbox, URL or by dragging it on the page.
Choose sln or any other format you need as a result (more than 200 formats supported)
Let the file convert and you can download your sln file right afterwards
About formats
Frequently Asked Questions
SLN is native to Asterisk PBX. Lossless FLAC input produces the clearest voice prompts and hold music.
Asterisk PBX, FreePBX, and VoIP platforms use SLN for prompts, hold music, and system audio.
SLN is 8 kHz, 16-bit signed integer, little-endian raw PCM for telephony.
Yes — lossless source means the SLN output has the best possible speech clarity.
Upload all FLAC prompts and convert them to SLN at once.