Give your customers’ voice new reach
Integrate and automate your voice calling needs with Bandwidth’s powerful and programmable Voice API
Voice API
Bandwidth’s programmable Voice API allows you to build a custom voice calling solution that’s right for you and your customers. Embed inbound and outbound calling capabilities directly into your application or product—all without the need for a telecom infrastructure of your own.
Easy as API
Made by developers for developers, our Voice API supports whatever language you’ve built your software on. This includes, PHP, Node.js, Ruby, C#, Java and Python, allowing easy embedded communications without having to start from scratch.
Support at every step
Need help taking your voice capabilities to the next level or solving a sticking point for your devs? Many claim to be support-centric, but we prove it by just being easier to do business with. We hold ourselves accountable through SLA achievement, a near perfect CSAT benchmark and a focus on making sure you’re successful.
Access our global IP network
Our network connects directly to the PSTN in 60+ countries covering more than 90% of the global economy. This gives your business the quality, control, and coverage to scale efficiently around the globe.
Simplified pricing & billing
Because Bandwidth Voice APIs are backed by our very own network, you get access to pricing only a network operator can provide. Get custom pricing tailored to your needs when you have a custom or high volume use case.
Scale from zero to unicorn, without sacrificing features
We know your solution requires a full-featured voice API, which is why you get access to all the tools you need with Bandwidth.
Conferencing
Whether your application requires a 2-person call with agent ‘whisper’ supervision or a full-blown 20 person conference, our flexible conferencing APIs have you covered.
Text-to-Speech
Build custom applications using SSML markup and Text-to-Speech (TTS) in a number of voices and languages. Want to play audio on calls from a professional voice actor? Our API supports WAV and MP3 audio playback for just that.
Call Control
Build custom call flows using things like call transfers, bridging, and call forwarding. Add capabilities like recording, transcription, media playback, and conferencing to build valuable communications workflows.
Interactive Voice Response (IVR)
Use our DTMF detection and media capabilities like Text-to-Speech and audio file playback to build a customized, self-service flow that fits your needs.
Recording & Transcription
Bandwidth's API makes recording and transcribing conversations or voicemails easy. Start and stop recording during a call for flexibility and security, in both dual-channel and mono recording format.
Answering Machine Detection
Using our Answering Machine Detection capability, you can build flexibility into your application to play TTS or connect a call depending on what or who has answered.
Extend your voice application by streaming with real-time call audio to your preferred tools via WebSocket. Build meaningful customer experiences by unlocking voice bots, sentiment analysis, voice biometrics, and more.
Based on average competitor prices as of October 2021.
Save money on every call
Since we own our voice network and the APIs, we can give you pricing that other providers can’t. And with 6-second billing increments, you only pay for the time you use, saving you and your customers money on every call.
How does the Voice API work?
A Voice API allows applications to access Bandwidth’s voice services using a HTTPS-based interface without the hassle of handling SIP infrastructure.
So rather than requiring a telecom expert, our Voice API allows you to access voice capabilities via a set of well-defined APIs that any web developer can use to rapidly develop communications enabled applications.
Want to know more?
Built for developers
Made by developers, for developers. Our powerful Voice API is dev friendly and has all the documentation you need to help you get voice up and running, no matter what you’re building.
We support a wide range of SDK’s.View SDKs
def transfer_call():
"""Transfer an incoming call to '+11234567892' with '+11234567891' as the Caller ID"""
response = Response()
speak_sentence = SpeakSentence(
sentence = "Transferring your call, please wait.",
voice = "paul"
)
phone_number = PhoneNumber(
number = "+11234567892",
transfer_answer_url = "http://myapp.com/announce"
)
transfer = Transfer(
transfer_caller_id = "+11234567891",
phone_numbers = [phone_number]
)
response.add_verb(speak_sentence)
response.add_verb(transfer)
return response.to_bxml()Start your Voice API free trial today!
Start making calls with our free Voice API trial, or talk to one of our experts to get your questions answered.
If you can think of it, we have a use case for you
Our customers are always thinking of new and innovative ways to use our Voice API. This is just a few of the things you can build. Have an idea we haven't thought of? Let's talk
IVR System
Build a better customer experience. Create a phone tree that gets customers to the right person faster.
Call Tracking
Accurately attribute calls using Bandwidth to build a carrier-grade call tracking & analytics platform.
Click-to-call
Turn search traffic into business. Enable click-to-call to remove barriers for customers connecting with businesses.
Outbound Notifications
Send automated voice recordings to your customers' phone, providing reminders, notifications, and alerts.
