drachtio review
A self-hosted SIP application server for developers who need deep call-flow control.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
drachtio combines a high-performance C++ SIP application server with the Node.js drachtio-srf framework. It is designed for developers and service providers building custom SIP services, communications applications and carrier-facing call flows. Applications connect to the server to process SIP traffic, create and manage dialogs, handle UAC and UAS flows, proxy requests, issue redirects and apply configurable HTTP request handlers. JavaScript is the framework language, while deployment targets include Linux, APIs, self-hosted environments and cloud setups.
Its strongest fit is detailed SIP control. Multiple transports and endpoints cover UDP, TCP, TLS and secure WebSockets, while call-detail record events expose call attempts, starts and stops. Prometheus metrics provide an endpoint for monitoring, and Homer/HEP capture support adds visibility into SIP traffic. Integrations with Homer, fail2ban and Kubernetes extend its operational ecosystem. Docker images and source installation give teams two self-hosted paths, making drachtio suitable when architecture and routing behavior need to remain under application-team control.
The trade-off is scope: drachtio is a SIP application server ecosystem, not a packaged numbers-and-voice API covering broader telephony workflows. Teams must operate the server, choose their deployment model and build the surrounding application logic. Documentation is the listed support channel. Choose drachtio when open-source SIP control, custom signaling and self-hosted deployment are priorities; consider another voice API when you need a broader managed communications product rather than a programmable SIP foundation.
drachtio pros and cons
- Where it wins
- Controls SIP dialogs, messages, proxies and routing with JavaScript APIs
- Supports UDP, TCP, TLS and secure WebSockets across configurable endpoints
- Includes call-detail events, Prometheus metrics and Homer/HEP capture support
- Where it doesn't
- Focused on SIP application control rather than a complete numbers-and-voice API
- Self-hosted deployment requires operating the server and supporting infrastructure
- Support is centered on documentation
drachtio fact sheet, pricing and score →
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
Last updated · How we research and update