Twilio

Twilio is a leading communications platform as a service (CPaaS), providing programmable APIs for voice, messaging, video, and email. The Twilio Super Network connects over 4,800 global carrier connections across 180+ countries, with an average route depth of four providers ensuring automatic failover and consistent delivery. Twilio's Elastic SIP Trunking offers unlimited capacity that scales on demand, instant provisioning in 100+ countries, and pay-as-you-go pricing without contracts or channel fees.

The platform includes programmable Voice APIs with TwiML for call control, Voice Insights for monitoring and troubleshooting, and Twilio Interconnect for private secure connections. Phone numbers are available in 100+ countries with instant API provisioning, number porting, toll-free, local, and short code options. Global infrastructure spans 8 Edge locations and multiple data centers in the US, Ireland, and Australia, with regional data residency options for GDPR compliance. The platform handles 1.8 trillion+ digital interactions annually for 335,000+ customers.

Vapi and Twilio together enable voice AI applications to connect with any phone number worldwide through enterprise-grade telephony infrastructure. Twilio provides the global carrier connectivity, phone number inventory, and SIP trunking that allows Vapi-powered voice agents to make and receive real phone calls at scale. This integration gives developers access to Twilio's Super Network—a battle-tested infrastructure with redundancy at every level, proactive route optimization, and 24/7 Network Operations Center monitoring.

Organizations can provision phone numbers via API, port existing numbers, and deploy voice AI agents globally without managing carrier relationships. Twilio handles the complexity of PSTN connectivity, compliance requirements, and call quality optimization across regions. The combination supports inbound and outbound calling for customer service automation, appointment scheduling, sales outreach, and contact center applications. Twilio's Voice Insights provides call quality analytics and troubleshooting, while regional Edge locations minimize latency for real-time voice interactions. Together, Vapi and Twilio deliver voice AI with the reliability, scale, and global reach that enterprise deployments require.