Telnyx and SIPNEX both serve the VoIP carrier market, but they approach it from different directions. Telnyx is a platform company that built carrier-grade infrastructure to serve developers and businesses with APIs. SIPNEX is a carrier built by dialer operators to serve other dialer operators. The distinction matters because it determines what each company optimizes for, where each one excels, and which type of customer gets the best experience.
This comparison is written by SIPNEX. We compete with Telnyx. We are biased. We will tell you where we are better and where Telnyx is better, because the worst outcome for both of us is a customer on the wrong platform.
Company profiles
Telnyx is a global CPaaS company headquartered in Chicago with offices worldwide. Telnyx has invested heavily in its own network infrastructure — unlike pure resellers, Telnyx owns and operates points of presence, has its own IP backbone, and maintains direct carrier interconnections. They offer voice, messaging, video, IoT, and networking products through developer-friendly APIs. Their customer base spans developers, enterprises, and telecom operators.
SIPNEX is an FCC-licensed US telecommunications carrier based in Lubbock, Texas. We hold our own carrier license, our own STIR/SHAKEN SP-KI certificate, our own FCC Form 499 filing, and we are registered in the Robocall Mitigation Database. Our focus is narrow: SIP trunking, DIDs, and voice services for call centers and dialer operations. We run VICIdial on our own network.
The comparison
Network infrastructure. Telnyx has a larger global network with more points of presence worldwide. For international calling, Telnyx likely has better coverage and lower latency to non-US destinations. For US domestic outbound — which is the primary use case for most dialer operations — both provide quality domestic termination. SIPNEX’s network is US-focused and optimized for high-volume domestic outbound, which is our customers’ primary workload.
STIR/SHAKEN. Both hold their own certificates and can provide A-level attestation for provisioned DIDs. Telnyx’s implementation is mature given their larger infrastructure investment. SIPNEX signs directly as the originating carrier. For dialer operators, both deliver the attestation level that matters.
Concurrent channels. Telnyx offers scalable channels through their API — pay-per-use with no hard cap, though per-channel costs may apply depending on the plan. SIPNEX offers unlimited channels with no per-channel fee. For predictive dialing where burst concurrency is unpredictable, SIPNEX’s model is simpler and cheaper.
Pricing. Telnyx publishes rates on their website — generally competitive with carrier-direct pricing, particularly for voice. Their pricing structure includes per-minute rates plus potential channel and number fees. SIPNEX publishes wholesale rates with per-minute pricing, DID fees, and no channel or platform fees. At equivalent volumes, SIPNEX is typically cheaper for US domestic outbound because we do not charge per-channel and our wholesale tiers are optimized for high-volume dialer operations.
API and developer tools. Telnyx wins this category decisively. They offer comprehensive voice, messaging, and networking APIs with good documentation, SDKs, and developer tools. SIPNEX does not have a developer API — we provide SIP trunk credentials. If you need programmable voice, Telnyx is the better choice.
Support for dialer operations. SIPNEX wins this category. Our support team runs VICIdial. When you call about sip.conf issues, AMD tuning, or CID rotation strategy, we have direct experience. Telnyx’s support is broader in scope (covering their full product line) and may not have dialer-specific expertise at tier 1. For operators running VICIdial, Asterisk, or FreePBX in high-volume outbound configurations, SIPNEX support understands the workload without escalation.
Product breadth. Telnyx offers voice, SMS, MMS, fax, video, wireless (IoT SIM cards), networking, and storage products. SIPNEX offers voice, DIDs, and messaging. If you need a single platform for multiple communication services, Telnyx provides more under one roof. If you need a carrier focused exclusively on doing voice exceptionally well for dialer operations, SIPNEX’s narrow focus is the advantage.
Who should use Telnyx
Telnyx is the right choice if: you need APIs for programmable voice or messaging, you have significant international calling needs, you want multiple communication services (voice, SMS, fax, IoT) from one provider, you have developers on staff who will build integrations, or your operation is primarily inbound or mixed inbound/outbound.
Who should use SIPNEX
SIPNEX is the right choice if: you run a predictive dialer at high volume (100K+ minutes/month), you need unlimited channels without per-channel fees, you need support from people who understand VICIdial and Asterisk, you want wholesale carrier-direct pricing without CPaaS markup, you value narrow focus on voice quality over product breadth, or your operation is primarily US domestic outbound.
Frequently asked questions
Is Telnyx a real carrier or a reseller?
Telnyx operates its own network infrastructure — they own points of presence, maintain an IP backbone, and have direct carrier interconnections. They hold their own STIR/SHAKEN certificate. Telnyx is more accurately described as a platform company with carrier-grade infrastructure than as either a traditional carrier or a pure reseller. They sit between the categories — more network control than a reseller like most VoIP providers, but more platform-focused than a traditional carrier like Bandwidth or SIPNEX.
Can I port numbers from Telnyx to SIPNEX?
Yes. Standard LNP porting process. Submit a Letter of Authorization to SIPNEX, we submit the port request, numbers transfer in 7-14 business days. You can dial on new SIPNEX DIDs immediately while Telnyx numbers port. No gap in service if the port is coordinated correctly.
Which is cheaper for high-volume outbound calling?
At equivalent volumes for US domestic outbound, SIPNEX is typically cheaper. The savings come from no per-channel fees (Telnyx may charge per concurrent channel depending on the plan), wholesale carrier-direct pricing (our rates are set by us, not marked up from an upstream carrier), and volume tiers optimized for high-minute operations. The exact difference depends on your volume, destination mix, and the specific Telnyx plan. Compare total monthly cost — minutes plus channels plus DIDs plus any platform fees — not just per-minute rates.
SIPNEX is the carrier built for operators who dial at volume. If Telnyx’s API platform is more than you need and their pricing is more than you want to pay, try SIPNEX. See our published rates.
Keep Reading
SIPNEX
FCC-licensed carrier with its own STIR/SHAKEN SP certificate. Operator-owned. SIP trunks built for operators who dial at volume.