TTS Providers

Configure text-to-speech providers for different voices and languages.

Overview

The Flow service supports multiple TTS providers. Configure them per action in the tts field.

Machine-readable voice list

The curated voice tables on this page, including links to the sample audio files, are also available as JSON under voices.json. Use it to populate voice pickers in your own UI.

Supported Providers

• Kugelaudio - German and multilingual voices, runs on sipgate infrastructure
• Azure Cognitive Services - 400+ voices in 140+ languages
• ElevenLabs - Ultra-realistic conversational voices

Kugelaudio

Configuration

{
  "type": "speak",
  "session_id": "session-123",
  "text": "Hallo!",
  "tts": {
    "provider": "kugelaudio",
    "voice": "963",
    "language": "de"
  }
}

Minimal Configuration (uses default sipgate voice):

{
  "type": "speak",
  "session_id": "session-123",
  "text": "Hallo!",
  "tts": {
    "provider": "kugelaudio"
  }
}

Available Voices

Voice Name	ID	Gender	Sample	Description
sipgate	963	Male		sipgate house voice (default)
Tim Schröder	972	Male		30-year-old native German professional
Anna Martin	973	Female		31-year-old German native, customer support
Lea Huber	978	Female		25-year-old native German, customer support
Sara Wagner	979	Female		29-year-old native German speaker
Marius Behnke	980	Male		35-year-old German, customer success manager

Azure Cognitive Services

Configuration

{
  "type": "speak",
  "session_id": "session-123",
  "text": "Hello!",
  "tts": {
    "provider": "azure",
    "language": "en-US",
    "voice": "en-US-JennyNeural"
  }
}

Popular Voices

Language	Voice Name	Gender	Sample	Description
en-US	en-US-JennyNeural	Female		Friendly, professional
en-US	en-US-GuyNeural	Male		Clear, neutral
en-GB	en-GB-SoniaNeural	Female		British, professional
en-GB	en-GB-RyanNeural	Male		British, friendly
de-DE	de-DE-KatjaNeural	Female		Professional, clear
de-DE	de-DE-ConradNeural	Male		Deep, authoritative

Full Voice List: See Azure TTS documentation

ElevenLabs

Configuration

{
  "type": "speak",
  "session_id": "session-123",
  "text": "Hello!",
  "tts": {
    "provider": "eleven_labs",
    "voice": "21m00Tcm4TlvDq8ikWAM"
  }
}

Voice IDs

The voice field is optional and accepts the ElevenLabs voice ID as a string. For example, "21m00Tcm4TlvDq8ikWAM" for "Rachel". If omitted, the first available voice will be used.

Minimal Configuration (uses default voice):

{
  "type": "speak",
  "session_id": "session-123",
  "text": "Hello!",
  "tts": {
    "provider": "eleven_labs"
  }
}

Available Voices

The "Sample" column plays a representative greeting from a voice assistant scenario. Multilingual voices include both German and English samples; voices verified for German only have a German sample. Click play — audio loads on demand.

Voice Name	ID	Sample	Description
sipgate	dSu12TX3MEDQXAarG4s6		Clean male voice used by sipgate for system announcements (default).
Rachel	21m00Tcm4TlvDq8ikWAM		Matter-of-fact, personable woman. Great for conversational use cases.
Drew	29vD33N1CtxCmqQRPOHJ		-
Clyde	2EiwWnXFnvU5JabPnv8n		Great for character use-cases
Paul	5Q0t7uMcjvnagumLfvZi		-
Aria	9BWtsMINqrJLrRacOk9x		Middle-aged female with African-American accent. Calm with hint of rasp.
Domi	AZnzlk1XvdvUeBnXmlld		-
Dave	CYw3kZ02Hs0563khs1Fj		-
Roger	CwhRBWXzGAHq8TQ4Fs17		Easy going and perfect for casual conversations.
Fin	D38z5RcWu1voky8WS1ja		-
Sarah	EXAVITQu4vr4xnSDxMaL		Young adult woman with confident, warm tone. Reassuring and professional.
Antoni	ErXwobaYiN019PkySvjV		-
Laura	FGY2WhTYpPnrIDTdsKH5		Young adult female with sunny enthusiasm and quirky attitude.
Thomas	GBv7mTt0atIp3Br8iCZE		Soft and subdued male voice, optimal for narrations or meditations
Charlie	IKne3meq5aSn9XLyUdCD		Young Australian male with confident and energetic voice.
George	JBFqnCBsd6RMkjVDRZzb		Warm resonance that instantly captivates listeners.
Emily	LcfcDJNUP1GQjkzn1xUU		-
Elli	MF3mGyEYCl7XYWbV9V6O		-
Callum	N2lVS1w4EtoT3dr4eOWO		Deceptively gravelly, yet unsettling edge.
Patrick	ODq5zmih8GrVes37Dizd		-
River	SAz9YHcvj6GT2YYXdXww		Relaxed, neutral voice ready for narrations or conversational projects.
Harry	SOYHLrjzK2X1ezoPC6cr		An animated warrior ready to charge forward.
Liam	TX3LPaxmHKxFdv7VOQHJ		Young adult with energy and warmth - suitable for reels and shorts.
Dorothy	ThT5KcBeYPX3keUQqHPh		-
Josh	TxGEqnHWrfWFTfGW9XjX		-
Arnold	VR6AewLTigWG4xSOukaG		-
Charlotte	XB0fDUnXU5powFXDhCwa		Sensual and raspy, ready to voice your temptress in video games.
Alice	Xb7hH8MSUJpSbSDYk0k2		Clear and engaging British woman, suitable for e-learning.
Matilda	XrExE9yKIg1WjnnlVkGX		Professional woman with pleasing alto pitch. Suitable for many use cases.
James	ZQe5CZNOzWyzPSCn5a3c		-
Joseph	Zlb1dXrM653N07WRdFW3		-
Will	bIHbv24MWmeRgasZH58o		Conversational and laid back.
Jeremy	bVMeCyTHy58xNoL34h3p		-
Jessica	cgSgspJ2msm6clMCkdW9		Young and playful American female, perfect for trendy content.
Eric	cjVigY5qzO86Huf0OWal		Smooth tenor pitch from man in his 40s - perfect for agentic use cases.
Michael	flq6f7yk4E4fJM5XTYuZ		-
Ethan	g5CIjZEefAph4nQFvHAz		-
Chris	iP95p4xoKVk53GoZ742B		Natural and real, down-to-earth voice great across many use-cases.
Gigi	jBpfuIE2acCO8z3wKNLl		-
Freya	jsCqWAovK2LkecY7zXl4		-
Brian	nPczCjzI2devNBz1zQrb		Middle-aged man with resonant and comforting tone. Great for narrations.
Grace	oWAxZDx7w5VEj9dCyTzz		-
Daniel	onwK4e9ZLuTAKqWW03F9		Strong voice perfect for professional broadcast or news story.
Lily	pFZP5JQG7iQjIQuC4Bku		Velvety British female voice delivers news with warmth and clarity.
Serena	pMsXgVXv3BLzUgSXRplE		-
Adam	pNInz6obpgDQGcFmaJgB		-
Nicole	piTKgcLEGmPE4e6mEKli		-
Bill	pqHfZKP75CvOlQylNhV4		Friendly and comforting voice ready to narrate your stories.
Jessie	t0jbNlBVZ17f02VDIeMI		-
Sam	yoZ06aMxZJJ28mfd3POQ		-
Glinda	z9fAnlkpzviPz146aGWa		-
Giovanni	zcAOhNBS3c14rBihAFp1		-
Mimi	zrHiDhphv9ZnVXBqCLjz		-

Choosing a Provider

Use Azure when:

• You need many languages (140+)
• You want consistent quality across all locales
• You need regional accents or dialects

Use ElevenLabs when:

• You need the most natural voices
• Conversational quality is critical
• You're working with English/European languages
• You want distinct personalities

Use Kugelaudio when:

• You need German-language voices
• You want voices running on sipgate infrastructure (no third-party cloud)
• Low latency for conversational German assistants is a priority

Examples

Python

# Azure voice
action = {
    'type': 'speak',
    'session_id': session_id,
    'text': 'Hello!',
    'tts': {
        'provider': 'azure',
        'language': 'en-US',
        'voice': 'en-US-JennyNeural'
    }
}

# ElevenLabs voice
action = {
    'type': 'speak',
    'session_id': session_id,
    'text': 'Hello!',
    'tts': {
        'provider': 'eleven_labs',
        'voice': '21m00Tcm4TlvDq8ikWAM'  # Rachel
    }
}

Next Steps

• Speak Action - How to use TTS
• Barge-In Configuration - Control interruptions