Best 8 Tools for Answering Calls in 2025

Cloudonix is a "Communications Platform as a Service" (CPaaS) that provides voice APIs, SIP trunking, and development tools for building voice applications. The platform is designed to add "superpowers" to AI voice agents by connecting them to phone systems, carriers, and business applications.

VoxImplant is a comprehensive cloud communications platform that enables businesses and developers to integrate voice, video, and messaging capabilities into their applications and services. Founded in 2013 and based in Palo Alto, the company serves millions of users worldwide through its innovative Communication Platform as a Service (CPaaS) solution.

CallPage is a lead generation and callback tool that helps businesses convert website visitors into phone conversations. Instead of hoping visitors will fill out contact forms or send emails, CallPage gives them a direct way to talk to your team right away.

Retell AI is an AI voice agent platform that lets businesses build, test, and deploy smart phone agents. These agents can handle both incoming and outgoing calls with human-like conversation skills and response times of under one second.

NLPearl AI is an AI-powered phone agent platform that creates virtual assistants called "Pearl" to handle business phone calls. Unlike regular chatbots, Pearl actually talks on the phone and sounds like a real human being.

Smallest.ai is an AI voice platform that provides the world's fastest text-to-speech technology and intelligent voice agents. The platform's core product, Lightning V2, can generate 10 seconds of natural speech in just 100 milliseconds, making it significantly faster than traditional voice synthesis tools.

Synthflow AI is a no-code voice automation platform that creates AI-powered phone agents for businesses. Instead of hiring more customer service staff, you can build virtual assistants that handle incoming and outgoing calls just like human employees would.

Genspark AI is an advanced AI agent engine that serves as both a next-generation search platform and an autonomous task automation system. At its core, Genspark uses specialized AI agents that work together to deliver personalized, real-time results through custom-generated pages called Sparkpages.