SLNG plugin for LiveKit Agents
Support for SLNG's voice AI gateway in LiveKit Agents, providing access to multiple STT and TTS providers through a unified API.
See https://docs.slng.ai/ for more information.
Installation
pip install livekit-plugins-slng
Pre-requisites
You'll need an API key from SLNG. It can be set as an environment variable: SLNG_API_KEY
Usage
Pass an SLNG model identifier; the plugin connects through SLNG's Unmute Bridge and builds the endpoint itself.
from livekit.plugins import slng
stt = slng.STT(
model="deepgram/nova:3",
language="en",
)
tts = slng.TTS(
model="deepgram/aura:2",
voice="aura-2-thalia-en", # provider voice ID, required
language="en",
)
Additional keyword arguments are forwarded to the gateway and applied according to the selected model's contract. Failover across multiple models or endpoints is available via connections=[...]; see docs.slng.ai for details.
End of turn finalization
For the lowest STT turn latency, let the plugin know when the user stops speaking. The plugin then sends a finalize signal so the provider returns the final transcript immediately instead of waiting for its own endpointing:
session = AgentSession(stt=stt, ...)
stt.attach_to_session(session)
Or wire it manually:
@session.on("user_state_changed")
def _on_user_state_changed(ev):
stt.notify_user_state(ev.new_state)
Without this hook the plugin still works, but end of turn detection relies entirely on the provider's endpointing, which typically adds a few hundred milliseconds per turn.
Region override
The plugin supports gateway region routing via the region_override option on both STT and TTS.
This maps directly to the gateway's X-Region-Override header.
See the available regions at docs.slng.ai/region-override.
You can pass either a single region:
stt = slng.STT(
api_key="your-slng-api-key",
model="deepgram/nova:3",
region_override="eu-west-1",
)
Or multiple preferred regions in priority order:
tts = slng.TTS(
api_key="your-slng-api-key",
model="deepgram/aura:2",
voice="aura-2-thalia-en",
region_override=["eu-west-1", "us-east-1"],
)
To constrain routing to a broad geographic zone instead of a specific region,
use world_part_override (for example "eu"), which maps to the gateway's
X-World-Part-Override header. region_override takes precedence when both
are set.
Migrating from 1.x
Version 2.0 is a breaking change:
- All traffic goes through the Unmute Bridge.
model_endpointandmodel_endpointswere removed; pass a model identifier orconnections=[...]instead. - STT no longer defaults to
model="deepgram/nova:3"; pass a model (orconnections) explicitly. - TTS
voiceis required and passed verbatim as the provider's voice identifier. - Language codes are no longer normalized client-side; send the value the model expects (for example BCP-47
hi-INfor Sarvam, nothi). - STT
recognize()(HTTP batch) is no longer supported; usestream(). Onlypcm_s16leinput audio is supported. api_tokenstill works on STT but is deprecated; useapi_key.
Metadata
Release files for livekit-plugins-slng 1.8.6
For a detailed explanation of source distributions (sdists) and built distributions (wheels), please see the package formats documentation.
Source distribution (sdist)
| File | Size | Uploaded | |
|---|---|---|---|
| livekit_plugins_slng-1.8.6.tar.gz | 32.4 kB | Details |
Built distribution (wheel)
| File | Interpreter | ABI | Platform | Reset |
|---|---|---|---|---|
| livekit_plugins_slng-1.8.6-py3-none-any.whl | Python 3 | none | any | Details |
Total release size: 67.5 kB
Release files / livekit_plugins_slng-1.8.6.tar.gz
| Download URL | livekit_plugins_slng-1.8.6.tar.gz |
|---|---|
| Size | 32.4 kB |
| Tags | Source |
|
SHA-256 checksum How to use checksums |
44c949ef603131d74b29048a70a5fa60d8a835690b92cf6ca7d594f07bf9fea5
|
|
BLAKE2b-256 checksum How to use checksums |
9c56901cc4368a3b31e037efe6b85370481b70853b86c6fce6b2110ea928aca5
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Oct 9, 2026.
Transparency logRelease files / livekit_plugins_slng-1.8.6-py3-none-any.whl
| Download URL | livekit_plugins_slng-1.8.6-py3-none-any.whl |
|---|---|
| Size | 35.1 kB |
| Tags | Python 3 |
|
SHA-256 checksum How to use checksums |
d566579bab2770bce029a60f44431102d4beb9c687d84c8b3f870b06a138f8c7
|
|
BLAKE2b-256 checksum How to use checksums |
661c97f4dbe8dcc1158e0d12e0cfc224de87212cd3d0dbaf75818bdee8226828
|
| Upload date | |
|
Uploaded using Trusted Publishing? What is trusted publishing? |
Yes |
| Uploaded via |
twine/7.0.0 CPython/3.13.14
|
Provenance
Provenance describes where a file came from. On PyPI, provenance is shared via attestations, which provide a verifiable record of the build or publishing details. View details, limitations and caveats.
PyPI Publish Attestation
PyPI verified that this artifact, at this checksum, originated from the publisher listed below.
Signed by GitHub Actions, verified by PyPI on Oct 9, 2026.
Transparency log
