Telnyx

Telnyx is a full-stack communications platform that owns and operates a private global network purpose-built for voice AI and real-time applications. As a licensed carrier in 30+ countries, Telnyx provides direct access to phone numbers, SIP trunking, and voice services without intermediary carriers. The platform achieves sub-200ms round-trip latency by colocating GPUs and telephony infrastructure at strategic global points of presence, keeping voice traffic off the congested public internet. Telnyx offers elastic SIP trunking that scales on demand, HD voice codecs for crystal-clear audio quality, and programmable Voice APIs with webhook-driven call control. The platform supports 250ms multilingual speech-to-text, in-house NaturalHD text-to-speech voices, and MCP integration for connecting voice agents to external systems.

Additional capabilities include phone number provisioning via API, number porting in 50+ countries, Microsoft Teams Operator Connect, and IoT connectivity through multi-network SIM cards. Compliance certifications include ISO, PCI, HIPAA, GDPR, and SOC2 Type II. Trusted by 14,000+ companies including OpenAI, IBM, Cisco, and Microsoft.

Vapi and Telnyx together deliver voice AI applications on carrier-grade global infrastructure. Telnyx provides the telephony backbone—SIP trunking, phone numbers, and PSTN connectivity—while Vapi orchestrates intelligent voice conversations. This combination gives developers a complete stack for building voice agents that make and receive real phone calls anywhere in the world. Telnyx's private network routes voice traffic through dedicated infrastructure rather than the public internet, reducing latency and improving audio quality for AI-powered conversations. Organizations gain access to phone numbers in 100+ countries, instant number provisioning via API, and the ability to scale call capacity without infrastructure constraints.

The integration supports both inbound and outbound calling scenarios: customer service agents, appointment scheduling, sales outreach, and IVR replacement. Telnyx handles complex carrier relationships, regulatory compliance, and number portability, allowing teams to focus on building conversation logic rather than managing telecom infrastructure. Together, Vapi and Telnyx enable voice AI deployments that meet enterprise requirements for call quality, reliability, and global reach.