Twilio is the world's leading cloud communications platform, powering messaging, voice, and video for millions of applications globally. With carrier connections in over 180 countries and delivery of billions of messages annually, Twilio has established itself as the industry standard for programmable communications infrastructure.

Authsignal partners with Twilio to provide SMS OTP delivery as part of our authentication platform. When you configure Twilio as your SMS provider in Authsignal, your one-time passwords route through Twilio's battle-tested messaging infrastructure. This partnership gives Authsignal customers access to Twilio's extensive carrier network, intelligent routing algorithms, and comprehensive delivery analytics.

The integration works seamlessly within Authsignal's authentication flows. When you initiate an SMS OTP challenge through Authsignal's API or SDK, the message is delivered via Twilio's platform to reach your users globally. You maintain full control over your authentication logic and user experience while Twilio handles the complexities of global SMS delivery, carrier relationships, and message routing optimization.

Twilio offers several advantages as the most mature and widely adopted communications platform in the market. Their extensive carrier partnerships typically provide the broadest geographic coverage and highest delivery rates. The platform's intelligent routing automatically selects the best path for each message based on cost, speed, and reliability. Twilio's comprehensive dashboard provides detailed delivery analytics, helping you monitor authentication performance and troubleshoot delivery issues.

This integration is particularly valuable for organizations requiring the highest delivery reliability and uptime guarantees, teams operating in markets where carrier relationships are complex or fragmented, businesses prioritizing broad geographic coverage across diverse regions, and companies needing detailed message analytics and delivery reporting for compliance or optimization.

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Who this integration is for:

• Organizations requiring proven reliability and industry-leading uptime SLAs
• Applications with users in diverse global markets requiring broad carrier coverage
• Teams prioritizing message delivery success rates over cost optimization
• Businesses needing comprehensive analytics and delivery reporting
• Companies in regulated industries requiring audit trails and compliance documentation

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Key benefits:

• Industry-leading reliability - 99.95% uptime SLA with proven at-scale performance
• Broadest carrier coverage - Direct connections to carriers in 180+ countries
• Intelligent routing - Automatic selection of optimal delivery paths for each message
• Comprehensive analytics - Detailed delivery reports, error codes, and performance metrics
• Regulatory compliance - Built-in tools for TCPA, GDPR, and regional SMS regulations
• Proven at scale - Trusted by enterprises processing millions of authentication messages daily

Prerequisites:

• Active Twilio account (sign up at twilio.com)
• At least one active phone number or messaging service in your Twilio account
• Authsignal account with SMS OTP authentication method enabled

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Setup overview:

1. Create or access Twilio account - Sign up for a Twilio account or log into your existing Twilio Console.
2. Set up phone number or messaging service:
   • Navigate to Phone Numbers in your Twilio Console
   • Purchase at least one SMS-enabled phone number, or
   • Create a Messaging Service with at least one sender
3. Locate your credentials:
   • From your Twilio Console dashboard
   • Find your Account SID (starts with "AC")
   • Find your Auth Token (click to reveal)
   • Copy both values securely
4. Configure in Authsignal Portal:
   • Log into the Authsignal Portal
   • Navigate to Settings > Authenticators
   • Click on SMS OTP
   • Select Twilio as your SMS provider
   • Enter your Twilio Account SID
   • Enter your Twilio Auth Token
   • Save your configuration
5. Test the integration:
   • Use Authsignal's test feature in the Portal to send a test SMS
   • Verify the message delivers successfully
   • Check delivery status in both Authsignal and Twilio dashboards

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Phone number vs Messaging Service:

Twilio supports two approaches for sending SMS:

• Phone number - Direct sending from a purchased number (simpler setup)
• Messaging Service - Pool of numbers with intelligent routing (better for high volume)

Authsignal works with either approach. Choose based on your volume and requirements.

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Regional considerations:

SMS delivery capabilities and regulations vary significantly by country. Some markets require:

• Sender ID registration
• Local phone numbers
• Specific message formatting or content restrictions

Check Twilio's country-specific guidelines for markets you're targeting.

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Cost optimization:

Twilio charges per message with rates varying by destination country. To optimize costs:

• Use Messaging Services for automatic least-cost routing
• Monitor delivery reports to identify expensive destinations
• Consider regional number pools for high-volume markets

For detailed API documentation and advanced configuration options, see the Authsignal SMS OTP documentation and Twilio SMS documentation.