Voice AI Infrastructure for Startups | SignalWire
SIGNALWIRE FOR STARTUPS
Build and ship without limits, then scale only when it's time
SignalWire gives startups a full programmable communications stack, voice, messaging, video, and AI, built on the engine behind large-scale telecom, with developer-first docs and usage-based pricing.
Configure your first AI agent
from signalwire import AgentBase
class MyAgent(AgentBase):
def __init__(self):
super().__init__(name="my-agent")
# Configure your agent here
THE PROBLEM
What slows startups down
You're moving fast. Your comms stack shouldn't be the bottleneck.
Opaque APIs
Black boxes that hide what's actually happening. Most platforms abstract so much that debugging is guesswork. You can't optimize what you can't see.
Pricing that punishes growth
Per-seat, per-minute, per-whatever…it adds up fast. Billing that looks affordable on day one turns into a budget conversation before you've found product-market fit.
Docs written for someone else
Guides built for marketing teams, not engineers. You shouldn't need a support ticket to figure out how to route a call. Real developer docs mean real self-service.
THE SOLUTION
Carrier-grade infrastructure, founder-friendly speed
Voice, messaging, video, and AI on one programmable stack: the same FreeSWITCH engine the biggest platforms run, wrapped in clean APIs you can ship against today.
Live before lunch
Real credentials in minutes, no sales call, no sandbox queue.
One stack, not six vendors
Not a CPaaS plus an SMS gateway plus a separate AI vendor.
Pricing that fits a seed budget
Usage-based from call one. No seat minimums, no platform fee.
Won't break at Series B
The same engine scales from your first call to your ten-millionth.
deply.py
from signalwire import AgentBase, AgentServer
class SalesAgent(AgentBase):
def __init__(self):
super().__init__(name="sales-agent")
self.add_language("English", "en-US", "rime.spore")
self.prompt_add_section("Role", "You are a sales representative.")
class SupportAgent(AgentBase):
def __init__(self):
super().__init__(name="support-agent")
self.add_language("English", "en-US", "rime.spore")
self.prompt_add_section("Role", "You are a support specialist.")
if __name__ == "__main__":
server = AgentServer(host="0.0.0.0", port=3000)
server.register(SalesAgent(), "/sales")
server.register(SupportAgent(), "/support")
server.run()
Developer Toolkit
Everything you need to build smarter voice systems
Code samples, quick starts, and templates for SignalWire's APIs, built to help you ship production-ready voice and AI features fast. Use the toolkit end-to-end, or drop in just the pieces you need.
Build voice agents with the Agent SDK
Prompt orchestration, tool calls (skills), barge-in handling, multi-agent support, and agent memory. Use modular skills and the integrated voice stack to design live AI behavior.
Structure prompts for consistent behavior
Tone control, fallback handling, and reusable logic across agents. Define reusable, named prompts inside the Agents SDK.
Store & retrieve context with the DataSphere RAG
AI agent memory, personalization, and retrieval-augmented grounding. Ground agents in your own data. Add the DataSphere skill to search a knowledge base mid-conversation.
Community
Where developers find their people and build what's next
From the FreeSWITCH project that started it all to the engineers shipping voice AI today. When you have questions, Discord, the forum, and the Friday Hangouts have answers.
12,000+ Discord members
38,000+ FreeSWITCH stars
20+ Years open source
Every Friday Hangouts
Learn
API reference, SDK guides, and quick starts at developer.signalwire.com, go from first call to production at your own pace.
ClueCon
Meet the team and the community in person at ClueCon, SignalWire's annual developer conference on telecom and AI
GitHub
Open-source SDKs, example code, and guides, all on GitHub. File issues, send pull requests, or fork it.
Customer proof
Shipped by developers who move fast
“Using that same [original] code base, we push almost 2.5 million minutes a month through SignalWire. It’s very scalable and very easy to do proof of concept and implementation in it.”
David Plappert Founder at PhoneLiveStreaming
Learn how a solo founder shipped a live-audio product in six hours and scaled it to 2.5 million minutes a month.
FAQS
Frequently asked questions
What to know before you build your first project, no sales call required.
Is SignalWire free to try?
You can create real credentials and start building immediately. There's no sandbox queue or sales call required to get access.How does pricing work for a small team trying SignalWire?
Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur.Do I need a sales call to get started with SignalWire?
No. You can sign up and get working credentials directly; sales involvement is optional, not required, for standard usage.Can SignalWire handle it if we grow fast?
Yes. The same underlying engine that SignalWire runs and maintains is used in large-scale telecom deployments, so scaling up doesn't require switching platforms.Do I need telecom experience to get started with SignalWire?
No. The docs and SDKs are written for application developers, not telecom engineers.What's the difference between SignalWire and a standalone AI voice tool?
SignalWire combines the underlying telephony (voice, SMS, video) with the AI agent layer natively, so you're not manually connecting an AI tool to a separate telephony vendor.
Let's build something together
Spin up test credentials in minutes. Ship to production on the same engine the biggest platforms trust.