Voice API for Programmable Business Calling
A Voice API lets your application trigger and manage phone calls programmatically - automated outbound alerts, IVR-driven campaigns and inbound call handling - instead of relying on manual dialing. Teleopedia's Voice & OBD Calling runs alongside WhatsApp, RCS and SMS on the same account, API and dashboard.
This page covers what a Voice API does, how Teleopedia's voice capability works, and where it fits into a broader communication strategy - not exact call quality, uptime or pricing figures, which depend on your plan and should be confirmed directly.
On this page:
How Voice API works, and programmable calling capabilities
IVR, OBD campaigns, call recording and multi-language voice bots
Integration, webhooks, security and scaling considerations
Multi-channel strategy with SMS and WhatsApp, plus FAQs
What Is A Voice API?
A Voice API is a programmable interface that lets an application trigger, receive and manage phone calls through code - placing an automated outbound call, running an IVR menu, or reporting call status back to your systems - rather than requiring a person to dial or answer manually.
How Voice API Works
ApplicationVoice APITelephony InfrastructureCustomer
Programmable Voice Calls
Core calling capability, confirmed as part of Teleopedia's Voice & OBD Calling feature set.
Outbound Calling
Trigger an automated call to a customer from your application - Teleopedia supports Outbound Dialer (OBD) campaigns for outreach at scale.
Inbound Calling
Handle incoming calls with a voice flow, using the same IVR capability that powers outbound campaigns.
Voice Notifications
Automated voice alerts for time-critical updates - Teleopedia supports this as a core voice use case.
Automated Voice Campaigns
Teleopedia supports OBD campaigns for outreach at scale, run alongside WhatsApp, RCS and SMS from the same account.
IVR Integration
Teleopedia supports Interactive Voice Response (IVR) flows as a core voice capability - see IVR API for the dedicated deep dive.
Click-to-Call & Missed Call Alerts
Teleopedia supports click-to-call and missed-call alert handling as part of its voice feature set.
Call Routing & Status
Call Routing
A voice flow (referenced by a flow ID) determines what happens on a call - an announcement, an IVR menu, or a specific outbound script.
Call Status
Calls report status back through the same webhook mechanism used across channels, so your application knows what happened on a given call.
Call Recording, Text-to-Speech & Speech Recognition
We're distinguishing what Teleopedia confirms versus general voice-industry capability here, rather than blurring the two:
Call Recording
Teleopedia supports call recording and analytics as part of its Voice & OBD Calling feature set.
Multi-Language Voice Bots
Teleopedia supports multi-language voice bots - the sample API request includes a language parameter (e.g. en-IN) per call.
Text-to-Speech
Teleopedia's voice flows can read dynamic content - like an OTP or order number - back to a caller. Voice platforms generally implement this through text-to-speech or pre-recorded audio; confirm which applies to your flow type with your account team.
Speech Recognition
Some voice/IVR platforms support speech recognition as an alternative to keypad (DTMF) input. This isn't a feature we're confirming as available on Teleopedia here - check with your account team for your plan's current capability.
Common Voice API Use Cases
Voice OTP
An automated call reads out a one-time code - useful when SMS OTP delivery is delayed or as a fallback verification method.
Appointment Reminders
A confirmation or reminder call for an upcoming appointment, one of the time-critical update types Teleopedia's voice alerts are built for.
Payment Reminders
An automated call reminding a customer about a due payment - a common application of time-critical voice alerts.
Logistics Notifications
Delivery-window or delay alerts by voice, useful as a fallback when a customer isn't responding on text channels.
Customer Support
Inbound IVR can present a menu and route a caller toward the right support flow. Live-agent transfer capability should be confirmed with your account team for your specific setup.
Lead Qualification
IVR and voice platforms are generally used for automated lead-qualification flows in the industry; confirm current support for this specific workflow with your account team.
Ready To Add Voice To Your Communication Stack?
Tell us your use case and we'll walk you through OBD campaigns, IVR flows and API access.
Voice API Integration
Triggering a voice call follows the same REST pattern as every other channel on the platform:
POST /voice/calls
Authorization: Bearer YOUR_API_KEY
Content-Type: application/json
{
"to": "+919876543210",
"flow_id": "obd_flow_delivery_alert",
"language": "en-IN"
}Call status is reported back through the same webhook shape used across channels:
{
"message_id": "voice_5c81ab",
"channel": "voice",
"status": "delivered",
"timestamp": "2026-09-21T10:42:00Z"
}Error Handling
A call may not connect for several reasons - an invalid or unreachable number, the call going unanswered, or a carrier-level rejection. Branch on the failure reason from the status webhook rather than treating every non-connection the same way, and trigger a configured fallback to SMS or WhatsApp where one exists for that use case.
Security & Privacy Considerations
Call Data Handling
Where call recording is used, treat recordings and transcripts as sensitive customer data, with access limited to who genuinely needs it.
API Key Handling
Store your Voice API key securely and rotate it periodically, the same as any other credential on your account.
Scaling Voice Calls
OBD campaigns are built for outreach at scale, but concurrency and throughput limits depend on your plan - confirm your account's current call-concurrency limits with your account team before planning a very large campaign, rather than assuming unlimited throughput.
Voice + SMS + WhatsApp Strategy
Voice is rarely the first channel a business tries - it's typically the step that guarantees a human eventually hears about something urgent, after WhatsApp or SMS haven't completed delivery within a configured window. See Omnichannel Messaging Platform for how Voice fits into a full channel-priority and fallback strategy alongside messaging.
Pricing Considerations
Voice pricing typically involves the underlying call/telephony cost plus platform charges - similar in structure to messaging channels, but we won't publish a flat rate here since it depends on call volume, destination and your plan. Talk to our team for a quote based on your actual usage.
Voice API FAQs
What is a Voice API?
A Voice API is a programmable interface that lets an application trigger, receive and manage phone calls - outbound alerts, automated campaigns, IVR menus - through code, rather than a person dialing manually.
How does Teleopedia's Voice API work?
Your application calls the API with a recipient number and a voice flow ID, and the call is placed through Teleopedia's telephony infrastructure to the customer, with status reported back through your configured webhook.
Does Teleopedia support outbound dialer (OBD) campaigns?
Yes, Outbound Dialer (OBD) campaigns for outreach at scale are a core part of Teleopedia's Voice & OBD Calling feature set.
Does Teleopedia support IVR?
Yes, Interactive Voice Response (IVR) flows are a supported Teleopedia voice capability - see IVR API for a dedicated breakdown of how IVR flows work.
Can Teleopedia's Voice API handle inbound calls?
Yes, inbound calling uses the same IVR and flow capability as outbound campaigns, so a caller can be presented with a menu or routed based on your configured logic.
Does Teleopedia support multi-language voice calls?
Yes, multi-language voice bots are a supported feature, and the API accepts a language parameter per call so a flow can be delivered in the recipient's preferred language.
Can voice calls be recorded?
Yes, call recording and analytics are part of Teleopedia's Voice & OBD Calling feature set.
Does Teleopedia's Voice API support text-to-speech?
Voice flows can read dynamic content like an OTP or order number back to a caller. Whether that's implemented via text-to-speech or pre-recorded prompts depends on the flow type - confirm the specifics with your account team.
Does Teleopedia support speech recognition in IVR?
This should be confirmed directly with your account team for your specific plan - some voice/IVR platforms in the industry support speech recognition as an alternative to keypad input, but we aren't confirming that as a documented Teleopedia feature on this page.
Can Voice API send a one-time password (OTP) by call?
Yes, an automated voice call reading out an OTP is a supported use case, often used as an alternative or fallback to SMS-based OTP delivery.
Is DLT registration required for voice calls in India?
Yes, DLT-registered voice templates are required for compliant outbound calling to Indian numbers, the same regulatory framework that applies to commercial SMS.
Can Voice API calls fall back to SMS or WhatsApp?
Voice is more commonly configured as the fallback destination after SMS or RCS, for the most time-critical updates - see Voice + SMS + WhatsApp Strategy on this page for how this fits into a broader channel plan.
How do I track the status of a voice call?
Call status is reported back through the same webhook mechanism used across every channel on your account, so your application can track whether a call was placed, connected or failed.
Is there a webhook for voice call events?
Yes, voice call status updates flow through the same webhook configuration used for WhatsApp, RCS and SMS delivery events on your account.
How is Voice API pricing structured?
Voice pricing typically involves the underlying call/telephony cost plus platform charges, similar in structure to messaging channels - we don't publish a flat rate here since it depends on call volume, destination and your plan. Talk to our team for a quote based on your actual usage.
Can Voice API scale to high call volumes?
Yes, OBD campaigns are built for outreach at scale - the practical considerations are your account's concurrency and throughput limits, which your account team can confirm for your plan.
Is Voice API available on the same account as WhatsApp, RCS and SMS?
Yes, Voice runs alongside WhatsApp, RCS, SMS and Email under the same Teleopedia account, dashboard and API.
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