Telephony Bot APIs

Telephony Bot APIs are callback style APIs (webhooks) that can connect bot frameworks to telephony, speech recognition and text-to-speech. Back-end web and bot developers can invoke these APIs to easily build conversational voice bots and speech-enabled IVRs.

* No credit card required.
Voicegain - Speech-to-Text
Under Your Control
Trusted by Companies building amazing products
Talk to your bot over phone,
Integrate with STT & TTS

Invite Voicegain right into your phone call. Let us be the “mouth” and “ear” to your bot logic. Works with any CCaaS or CPaaS platform.



Twilio, SignalWire, Telnyx, Avaya, Genesys, Freeswitch, Asterisk and more

Bot Frameworks


RASA, Dialogflow, AWS Lex, Azure, and more



Integrate with Microsoft, Google & Voicegain ASR



Neural voices in different accents & languages. Compatible with SSML

Simple to use,
Flexible to meet your needs
  • Easy to use
    Configure integration with Telephony, Text-to-Speech & ASR in minutes
  • Any Bot Framework
    Supports any Bot Framework with REST APIs for Bot interactions
  • FreeSWITCH & Asterisk
    Integrate with your FreeSWITCH or Asterisk using SIP INVITE
  • Hints, Grammars & More
    Pass Hints, speech grammars to get high accuracy
  • YAML Declarative IVR
    Write your simple IVR/Bot flow in YAML and interact with our API
  • Bring your CPaaS
    Integrate with CPaaS platforms – Twilio, SignalWire, Telnyx and more
  • Get High Accuracy
    Train custom models to get unmatched accuracy
  • Any Backend language
    Write your bot logic in Python, Node or any language that send talk JSON
  • Buy Phone Numbers
    Buy phone numbers, connect to your Bot with our internal CPaaS
Can I access the API documentation?
How are Voicegain Telephony Bot
APIs priced?
Do you offer support?
Can you integrate with my existing
CPaaS or CCaaS platform?
Can I test these APIs for free?
How do I integrate with my Bot
Which Bot Frameworks do you
Audio Sources
Bot Frameworks
Meeting Platforms
Check out our blog for insights, benchmarks, sample code, and more
Voicegain Blog
What our customers are saying..
Sign up for an app today
* No credit card required.


Interested in customizing the ASR or deploying Voicegain on your infrastructure?

Contact Us → 
Voicegain - Speech-to-Text
Under Your Control