Important: This is an add-on plugin for AgentLabs. You must purchase and install the main AgentLabs application for this plugin to work.
Buy AgentLabs (Main Required Item)

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

Create a SIP trunk in your provider dashboard
Add the SIP trunk inside AgentLabs
Import your phone numbers
Assign AI agents to numbers
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

SIP Trunk add-on | AgentLabs - AI Voice Calling Agents & Lead Intelligence SaaS Platform