FreeSWITCH vs Kaleyra Voice API
FreeSWITCH
signalwire.comKaleyra Voice API
tatacommunications.comSide by side
| Figure | FreeSWITCH | Kaleyra Voice API |
|---|---|---|
| Price from | Free | — |
| Free plan | Yes | — |
| Free trial | — | — |
| Open source | — | — |
| Windows | Yes | — |
| macOS | Yes | — |
| Linux | Yes | — |
| API | Yes | Yes |
| Self-hosted | Yes | — |
| Plans published | 3 | 1 |
| Spec score · Voice APIs | 8.0 (#10) | 6.9 (#17) |
| Integrations | FreeSWITCH documents integrations through HTTP backends, embedded Lua, Perl, Python, JavaScript and Java, and SignalWire connectivity. | The APIs are designed to integrate with CRMs, marketing platforms, agent desktops, and custom apps using standard interfaces. |
| Support | The open-source edition has community support, while SignalWire offers commercial support, hardened builds, and priority patches through FreeSWITCH Pro. | Tata Communications offers guidance, tailored deployment support, and dedicated onboarding support for the API. |
| Use cases | The maker describes FreeSWITCH as powering carriers, contact centers, and communication products. | The page lists IVR, outbound campaigns, click-to-call, call masking, reminders, emergency alerts, and automated support as use cases. |
Plans
FreeSWITCH
- FreeSWITCH Open SourceFree
- FreeSWITCH AdvantagePriced on request
- SignalWire PlatformPriced on request
In their own words
FreeSWITCH
FreeSWITCH is an open-source framework for real-time voice and video communications. It can route calls, bridge video, transcode media, and connect protocols, and is designed for use in carriers, contact centers, and communication products. Its Event Socket exposes call control, channel management, and internal events to external processes over TCP. Integrations include HTTP backends, embedded Lua, Perl, Python, JavaScript, Java, and SignalWire connectivity. The mod_signalwire module connects to SignalWire for inbound and outbound PSTN calling over a persistent WebSocket session. Linux installation guidance covers Debian and Ubuntu using SignalWire packages or a source build. A free SignalWire account is required to access packages and downloads. FreeSWITCH is licensed under MPL 2.0 and can run in production at no cost; self-hosting requires dedicated resources to maintain on-premises infrastructure. The open-source edition has community support, while FreeSWITCH Pro offers commercial support, hardened builds, priority patches, and commercial modules including answering machine detection and licensed G.729 Annex A encoding and decoding.
Kaleyra Voice API
Kaleyra Voice API has no write-up on Specifiction yet; its figures are above.