volume

from signalwire.relay import RelayClient
client = RelayClient(
    project="your-project-id",
    token="your-api-token",
    contexts=["default"],
)
@client.on_call
async def handle_call(call):
    await call.answer()
    action = await call.play(
        [{"type": "audio", "params": {"url": "https://example.com/hold-music.mp3"}}],
        loop=0,
    )
    # Increase volume
    await action.volume(10.0)
    # Decrease volume
    await action.volume(-5.0)
client.run()