WMA to SLN Converter
Create Asterisk PBX signed linear audio from WMA
Asterisk PBX Ready
SLN is what Asterisk expects — convert WMA for your VoIP phone system.
Bulk Deployment
Process all WMA prompts to SLN simultaneously.
Online Encoding
No Asterisk server needed for conversion — produce SLN from WMA in your browser.
How to convert WMA 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 the native raw audio format for Asterisk PBX systems. VoIP prompts, hold music, and IVR recordings must be in SLN — Asterisk cannot decode WMA files at all.
Asterisk PBX, FreePBX, Issabel, and other VoIP platforms consume SLN for system prompts, on-hold audio, and interactive voice response menus without any extra modules.
SLN is headerless raw PCM — 8 kHz sample rate, 16-bit signed integer, little-endian byte order. These specs match standard telephony requirements for clear voice reproduction.
SLN is telephony-grade at 8 kHz, so the output is voice-optimized rather than music-quality. Speech and announcements convert well; complex audio may lose some detail.
Yes — upload your entire collection of WMA voice prompts and convertio.tools produces individual SLN files for each, letting you deploy a complete Asterisk sound library quickly.