Twilio vs Telnyx for SIP Trunking

Telnyx's carrier-direct SIP trunking undercuts Twilio Elastic SIP on outbound rates by up to 60 percent. Here is a detailed comparison of SIP trunking pricing, reliability, features, and when to choose each.

Danial A

Senior Twilio Consultant, Telphi Consulting

June 21, 2026

8 min read

Twilio

Comparison

Alternatives

SIP trunking is the technology that connects a business's existing PBX or UCaaS platform to the public telephone network through an IP connection, and the choice of SIP trunking provider has a direct and significant impact on per-minute calling costs. Telnyx and Twilio Elastic SIP Trunking are two of the most developer-friendly SIP trunk providers in the market, but they differ substantially on per-minute pricing, network architecture, and the depth of configuration options available to technical teams.

Pricing Comparison

Telnyx SIP trunking charges approximately $0.001 per minute for inbound calls and $0.005 per minute for outbound calls in the United States. Twilio Elastic SIP Trunking charges $0.0015 per minute for inbound and $0.013 per minute for outbound. On outbound calls, Telnyx is approximately 62 percent cheaper than Twilio: $0.005 versus $0.013 per minute. For a business making 100,000 outbound minutes per month, Telnyx costs $500 versus Twilio's $1,300, a saving of $800 per month. At 1 million outbound minutes per month, the saving is $8,000 per month, which is substantial enough to justify significant engineering effort to switch providers. Inbound pricing is closer: Telnyx at $0.001 versus Twilio at $0.0015, a smaller proportional difference.

Network Architecture and Reliability

Telnyx operates its own global IP network with points of presence in major carrier exchanges, giving it more control over voice routing and latency than providers that rely entirely on third-party carrier connections. This carrier-direct positioning is similar to how Telnyx approaches SMS, and it produces competitive per-minute rates because Telnyx is not paying a full CPaaS markup. Twilio's Elastic SIP Trunking is backed by Twilio's global carrier network and 99.95 percent uptime SLA, with geo-redundant infrastructure and automatic failover. Both platforms support SIP registration (for your PBX to register with the provider) and IP authentication (for server-to-server SIP without registration), giving technical teams flexibility in how they configure their existing phone systems.

Configuration, Features, and Ecosystem

Twilio Elastic SIP Trunking benefits from the broader Twilio ecosystem: you can configure voice URLs on your SIP trunk that pass calls through Twilio Studio flows before delivery, add Twilio Verify for caller authentication, or integrate with Twilio Flex for contact center use cases. This ecosystem integration is Twilio's strongest differentiator over Telnyx for SIP: if you want to add IVR or call flow logic to SIP trunking without running your own Asterisk server, Twilio's integration makes it easy. Telnyx supports configurable call routing through its own Mission Control Portal and has a TeXML language (similar to TwiML) for building call flow logic, providing comparable programmability without Twilio's ecosystem depth.

Which Should You Choose

Choose Telnyx SIP Trunking if outbound per-minute cost is your primary decision factor, your existing PBX handles call routing without needing Twilio's additional call flow products, and you are comfortable working with a SIP provider whose developer community is smaller but whose per-minute economics are substantially better. Choose Twilio Elastic SIP Trunking if you want to combine SIP trunking with Twilio Studio call flows, Twilio Flex contact center integration, or other Twilio products that add value beyond raw carrier connectivity, or if you prefer the larger community and documentation ecosystem that comes with Twilio. The 62 percent outbound cost saving with Telnyx is material at high call volumes and should be modeled carefully before making a SIP trunk decision. Our team has migrated clients between Twilio and Telnyx SIP and can manage the transition without call disruption.

Conclusion

Telnyx offers up to 62 percent lower outbound per-minute SIP trunking costs versus Twilio Elastic SIP, making it the stronger economic choice for high-volume outbound calling when Twilio ecosystem integration is not required. Contact our team to model the cost savings for your specific call volume and scope a migration plan if the economics favor Telnyx.