VaxVoIP Agent AI SDK vs Maison Cartouche

A side-by-side comparison built from both listings. Blank cells mean the company has not given that detail; we never guess.

VaxVoIP Agent AI SDK compared with Maison Cartouche
Detail	VaxVoIP Agent AI SDK	Maison Cartouche
What it does	SIP-to-OpenAI gateway for building real-time multilingual AI voice agents	API for sending handwritten letters through AI agents and assistants
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	DE
Pricing model	Paid	Not given
Pricing	Annual commercial licensing: 10 concurrent calls $1,480, 20 concurrent calls $2,620, 40 concurrent calls $4,420, 80 concurrent calls $6,420, 160 concurrent calls $8,860, Unlimited concurrent calls $10,680, Unlimited services and unlimited concurrent calls $16,860 (all USD, one year, contact sales)	Not given
Key features	SIP server and IP-PBX integration OpenAI real-time speech-to-speech models Multilingual voice interaction Real-time SIP audio processing Sample source code in C#, VB.NET, and Delphi 30-day fully functional trial Simplified OpenAI integration Commercial B2B deployment licensing	Agent policy configuration with send limits and approval settings Relationship management with contact details restricted from API Moment tracking for birthdays and anniversaries Letter quote and pricing with customizable upgrades Real-time send tracking with multiple status states Address request generation with privacy protection Webhook event system with signature verification OAuth support for custom connectors like Claude
What makes it different	Gateway handles SIP audio bridging so developers focus on voice-agent logic Direct real-time connection between SIP calls and OpenAI speech models Eliminates complex OpenAI protocol and media integration overhead Includes working sample projects with documentation and demo videos Supports natural multilingual conversations on live calls	Same API primitives used in the app itself Hands-on compliance with frequency limits and approval workflows Model Context Protocol integration for AI assistants Hosted MCP server with no installation required
Community votes	0	0
DR (Domain Rating by Ahrefs)	25 +1 (up) since last check	Not checked yet no change since last check
Trust Flow (Majestic)	44	0
Citation Flow (Majestic)	31	0
Referring domains (Majestic)	95	0

3 details filled in for both companies.

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