Sinch Voice API
Programmable voice calls for apps, websites, and workflows
At a glance
- Editor scoreNot yet scored
- PricingPaid
- Best forDevelopers wanting low-cost API voice basics
- Free planNo
- Inbound callingYes
- Founded2008 · Stockholm, Sweden
- Facts checked19 Sep 2026
Where it wins
- Supports inbound, outbound, SIP, IVR, recording, and transcription
- Provides callbacks, webhooks, and SVAML for programmable call flows
- Official SDKs cover Node.js, Java, .NET, and Python
Where it doesn't
- API-only platform with no free plan
- Usage-based pricing varies by destination and configuration
- More than 10 concurrent calls requires contacting an account manager
Our verdict on Sinch Voice API
Sinch Voice API gives businesses a programmable way to make and receive voice calls through REST APIs and official SDKs. It supports inbound calls to Sinch phone numbers, outbound PSTN calling, SIP connectivity, phone-number provisioning, and call-flow control through callbacks, webhooks, and SVAML. Developers can also add IVR menus, text-to-speech, conferencing, number masking, recording, and transcription. It is best suited to teams building voice features into applications, websites, or automated workflows rather than users seeking a standalone calling interface.
Pricing is usage-based rather than tiered. Calling charges are calculated per minute, with separate number or feature fees depending on the destination and configuration. The published pricing information includes some international, in-app, and SIP call categories with no per-minute charge, while rates vary across countries, destinations, call legs, and features. This structure can suit developers who want to match spending to call volume, but estimating total costs requires reviewing the relevant routes and enabled capabilities. There is no free plan, so it fits projects prepared to manage usage-based billing.
The API covers a broad set of core voice requirements, including PSTN and SIP connectivity, programmable menus, cloud-storage destinations for recordings, transcription, and conferencing. SDKs for Node.js, Java, .NET, and Python support common development environments, while phone numbers can be provisioned through the Sinch dashboard or Numbers API. The stated default concurrent-call limit is 10; teams needing more must contact an account manager. Choose Sinch Voice API when you need API-controlled voice basics across several languages and calling modes. Consider another option if you need a visual product, a free plan, or higher concurrency without an account-management step.
Sinch Voice API pricing
Sinch Voice API fact sheet
| Free plan | No |
|---|---|
| Paid from | Not verified |
| Inbound calling | Yes |
| Outbound calling | Yes |
| Phone number support | Yes |
| SIP support | Yes |
| Call recording | Yes |
| Concurrent call limit | 10 calls |
| SDK languages | Node.js, Java, .NET, Python |
| Pricing | Paid (source) |
| Website | sinch.com |
| Facts checked | 19 Sep 2026 |
Alternatives to Sinch Voice API
- Twilio Programmable VoiceA broad voice API for calling, IVR, SIP, recording, conferencing, and SDK-based apps.—
- Vonage Voice APIA broad voice API for building PSTN, SIP, WebRTC, IVR, and AI call workflows.—
- Twilio Elastic SIP TrunkingA focused SIP-to-PSTN service with secure trunking and pay-as-you-go voice charges.2.6
See all Sinch Voice API alternatives →
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