VaxVoIP Agent AI SDK vs LinkupAPI

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 LinkupAPI
Detail	VaxVoIP Agent AI SDK	LinkupAPI
What it does	SIP-to-OpenAI gateway for building real-time multilingual AI voice agents	Connect your users' LinkedIn, email, WhatsApp and iMessage accounts to send messages at scale and get every reply back through one API
Stage	Not given	Not given
Founded	Not given	Not given
Based in	Not given	FR
Pricing model	Paid	Paid
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)	$55/month for up to 10 connected accounts, $5.50 per account for 11–50 accounts, $5.00 per account for 51–200 accounts, $4.50 per account for 201–640 accounts, $3,000/month flat for unlimited accounts. Dedicated iMessage lines $199/month per line. Unlimited usage on all channels; no per-call fees.
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	LinkedIn messaging, invitations, Sales Navigator InMails, posts and engagement Email outreach from Gmail, Outlook and SMTP with email finder and verification WhatsApp messaging with text, files and voice notes Dedicated iMessage lines with US and UK numbers Real-time webhook delivery of replies and bounces MCP server for Claude, ChatGPT and Gemini integration Device signature binding for account security No-code integration via Make, n8n and Zapier Account health monitoring with real-time alerts
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	Unified API for four channels with the same request format across LinkedIn, email, WhatsApp and iMessage Account safety prioritized with dedicated infrastructure and real-time monitoring rather than blind limits Price capped at $3,000/month regardless of scale after 640 connected accounts GDPR and CCPA compliant with EU-hosted data and Google-verified security
Community votes	0	0
DR (Domain Rating by Ahrefs)	25 +1 (up) since last check	42 +1 (up) since last check
Trust Flow (Majestic)	44	4
Citation Flow (Majestic)	31	31
Referring domains (Majestic)	95	77

5 details filled in for both companies.

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