Important: This is an add-on plugin for AgentLabs. You must purchase and install the main AgentLabs application for this plugin to work.
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SIP Trunk Engine Plugin for AgentLabs

The SIP Trunk Engine Plugin allows you to connect your own SIP trunks and phone numbers to AgentLabs, enabling AI-powered inbound and outbound voice calls using industry-standard SIP providers.

This plugin is designed for businesses and SaaS owners who want full control over telephony costs, providers, and routing, while leveraging AI voice agents powered by ElevenLabs or OpenAI Realtime.

Key Capabilities

• Bring Your Own SIP Trunk (BYOT)
• Inbound and outbound AI voice calls
• Supports ElevenLabs SIP and OpenAI SIP engines
• Works with 13+ popular SIP providers
• Bulk calling and campaign support (ElevenLabs SIP)
• Per-plan limits for trunks, numbers, and concurrency
• Secure credential storage and webhook verification

Supported SIP Engines

ElevenLabs SIP Engine

• Inbound and outbound calls
• Bulk outbound campaigns
• Natural, Flow, and Incoming AI agents
• Server-side call recordings (via ElevenLabs)
• Per phone-number provisioning

OpenAI SIP Engine

• Inbound calls only
• Uses OpenAI Realtime (GPT-4o)
• Incoming agents for real-time conversations
• Transcripts available (no server-side recordings)
• Project-level provisioning

Supported SIP Providers

Preconfigured provider templates with auto-filled defaults:

• Twilio
• Plivo
• Telnyx
• Vonage
• Bandwidth
• Exotel
• DIDWW
• Zadarma
• Cloudonix
• RingCentral
• Sinch
• Infobip
• Generic SIP Provider (custom)

How It Works

1. Create a SIP trunk in your provider dashboard
2. Add the SIP trunk inside AgentLabs
3. Import your phone numbers
4. Assign AI agents to numbers
5. Route calls from your provider to ElevenLabs or OpenAI SIP

Admin & SaaS Controls

• Enable or disable SIP access per subscription plan
• Limit number of SIP trunks per user
• Limit phone numbers per user
• Control concurrent SIP calls
• View all user SIP trunks and numbers

Security

• TLS-supported SIP transport
• Webhook signature verification (OpenAI SIP)
• Credentials hidden from API responses
• Rate-limited phone number imports

Requirements

• AgentLabs platform (required)
• Node.js 18+
• PostgreSQL database
• ElevenLabs account and/or OpenAI account
• Active SIP provider account

Included

• SIP Engine Plugin source code
• Admin and user UI components
• Detailed documentation

Important Notes

• This is a plugin, not a standalone application
• Outbound calling is supported only with ElevenLabs SIP

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