# BubblyPhone Agents

> Developer platform for building AI voice agents that make and receive real
> phone calls. REST API, your own model keys (BYOK), real phone numbers, and
> pay-as-you-go billing with no seats and no platform fee.

BubblyPhone Agents (agents.bubblyphone.com) lets developers build AI phone
agents programmatically: buy a number, define an agent and its tools, and the
platform handles telephony, speech, turn-taking and call control. Calls are
billed per minute of talk time plus a monthly fee per number. There is no
seat licence and no minimum contract.

## Machine-Readable

Plain markdown, generated from live configuration. Prefer these over the HTML
pages for anything price-related — /pricing is a client-rendered rate lookup
and will look empty without JavaScript.

- [Pricing](https://agents.bubblyphone.com/pricing.md): Complete pricing: per-minute call rates, number fees, billing rules, worked cost examples. Authoritative.

## Core Pages

- [API Documentation](https://agents.bubblyphone.com/docs): Full REST API reference: agents, calls, numbers, tools, webhooks
- [Pricing](https://agents.bubblyphone.com/pricing): Live per-prefix rate lookup and billing detail
- [Industries](https://agents.bubblyphone.com/industry): How the platform is applied per vertical
- [Glossary](https://agents.bubblyphone.com/glossary): Voice-AI terminology reference
- [Blog](https://agents.bubblyphone.com/blog): Platform comparisons, developer guides and voice-AI engineering notes
- [Contact](https://agents.bubblyphone.com/contact): Sales and support

## Industries

- [AI Phone Agents for Healthcare — HIPAA-Aware Call Handling](https://agents.bubblyphone.com/industry/healthcare): AI phone agents for medical practices. Handle appointment booking, intake, and after-hours calls with HIPAA-aware configuration. Stop missing patient calls.
- [AI Phone Agents for Dental Practices — Book More, Miss Less](https://agents.bubblyphone.com/industry/dental): AI phone agents for dental offices. Book appointments 24/7, recover new patient calls, reduce no-shows, and stop losing $100K+ a year to missed calls.
- [AI Phone Agents for Therapy Practices — Intake, Not Crisis](https://agents.bubblyphone.com/industry/mental-health): AI phone agents for mental health and therapy practices. Handle intake, waitlists, and scheduling safely — while routing every crisis call immediately to trained humans or 988.
- [AI Phone Agents for Insurance Agencies — Quotes, FNOL, Service](https://agents.bubblyphone.com/industry/insurance): AI phone agents for insurance. Capture inbound quote leads 24/7, automate first notice of loss (FNOL), and handle policy service calls without missing inquiries.
- [AI Phone Agents for Law Firms — Intake, Not Advice](https://agents.bubblyphone.com/industry/legal): AI phone agents for law firms. Capture every intake call 24/7, schedule consultations, and route urgent matters — while keeping privileged conversations with humans.
- [AI Phone Agents for Banks & Credit Unions — Member Service](https://agents.bubblyphone.com/industry/financial-services): AI phone agents for banks and credit unions. Handle account questions, loan intake, and routine service 24/7 under FFIEC, NCUA, and GLBA compliance frameworks.
- [AI Phone Agents for Mortgage Brokers & Lenders](https://agents.bubblyphone.com/industry/mortgage): AI phone agents for mortgage brokers. Capture rate inquiries, take pre-application intake, and follow up on leads under the new 2025 TCPA 1:1 consent rules.
- [AI Phone Agents for Real Estate — Answer Every Lead](https://agents.bubblyphone.com/industry/real-estate): AI phone agents for real estate agents and brokerages. Respond to every lead in under a second, book showings 24/7, and capture the buyers that currently go to the next agent.
- [AI Phone Agents for HVAC, Plumbing & Home Services](https://agents.bubblyphone.com/industry/hvac): AI phone agents for HVAC, plumbing, and home services contractors. Answer every emergency call, book service appointments 24/7, and stop losing $45K–$120K a year to voicemail.
- [AI Phone Agents for Auto Dealerships — Sales BDC & Service](https://agents.bubblyphone.com/industry/automotive): AI phone agents for auto dealerships. Capture every sales lead, book service appointments 24/7, and stop losing $1M+ per store per year to missed calls.
- [AI Phone Agents for Hotels & Restaurants — Reservations 24/7](https://agents.bubblyphone.com/industry/hospitality): AI phone agents for hotels and restaurants. Take reservations around the clock, answer guest questions, and stop losing $100K+ a year to missed calls and hold queues.

## Glossary

- [Backchanneling](https://agents.bubblyphone.com/glossary/backchanneling): Backchanneling is the short verbal signals a listener produces during a conversation — sounds like “mhm”, “uh-huh”, “right”, or “okay” — that tell the
- [Call Logging](https://agents.bubblyphone.com/glossary/call-logging): Call logging is the process of recording structured metadata about every call that passes through a phone system — who called whom, when, for how long
- [Outbound Calling](https://agents.bubblyphone.com/glossary/outbound-calling): Outbound calling is when a phone system initiates a call to an external number, rather than receiving one. In AI phone agents, outbound calls are trig
- [Call Flow](https://agents.bubblyphone.com/glossary/call-flow): A call flow is the sequence of steps and decisions that a phone system takes between the moment a call is answered and the moment it ends — including 
- [Call Analytics](https://agents.bubblyphone.com/glossary/call-analytics): Call analytics is the analysis of call data — metadata, transcripts, recordings, and events — to produce aggregate metrics, quality scores, and action
- [Warm Transfer](https://agents.bubblyphone.com/glossary/warm-transfer): A warm transfer is a call handoff where context about the caller and the conversation is passed to the receiving party before, or at the moment, the c
- [Cold Transfer](https://agents.bubblyphone.com/glossary/cold-transfer): A cold transfer (also called a blind transfer) is a call handoff where the caller is routed to a new destination with no context passed along — the re
- [Interactive Voice Response (IVR)](https://agents.bubblyphone.com/glossary/ivr): Interactive Voice Response (IVR) is an automated phone system that interacts with callers through pre-recorded prompts and collects input via keypad t
- [Dynamic Variables](https://agents.bubblyphone.com/glossary/dynamic-variables): Dynamic variables are placeholders in an AI agent’s system prompt that are filled in at call time with per-call data — the caller’s name, a looked-up 
- [Call Transcription](https://agents.bubblyphone.com/glossary/call-transcription): Call transcription is the conversion of a phone conversation into readable text — either in real time as the conversation happens or as a post-process
- [Post-Call Analysis](https://agents.bubblyphone.com/glossary/post-call-analysis): Post-call analysis is the automated processing of a completed phone call — transcript, recording, and metadata — to extract structured information lik
- [Sentiment Analysis](https://agents.bubblyphone.com/glossary/sentiment-analysis): Sentiment analysis is the classification of text or speech along an emotional axis — typically positive, neutral, or negative — to measure how a calle
- [Concurrent Calls](https://agents.bubblyphone.com/glossary/concurrent-calls): Concurrent calls is the number of phone calls a system is handling simultaneously at a given moment in time — the capacity ceiling that determines how
- [Call Automation](https://agents.bubblyphone.com/glossary/call-automation): Call automation is the use of software to perform any part of a phone call workflow without human involvement — from dialing and routing to full end-t
- [Dialogue Management](https://agents.bubblyphone.com/glossary/dialogue-management): Dialogue management is the component of a conversational system that decides what to do next at each turn — what to say, what to ask, when to take an 
- [Intent Detection](https://agents.bubblyphone.com/glossary/intent-detection): Intent detection is the classification of what a user is trying to accomplish from their utterance — mapping an arbitrary phrase like “I want to chang
- [Automatic Call Distribution (ACD)](https://agents.bubblyphone.com/glossary/acd): Automatic Call Distribution (ACD) is the telephony system function that answers incoming calls and routes them to the appropriate agent, queue, or des
- [Knowledge Base Integration](https://agents.bubblyphone.com/glossary/knowledge-base-integration): Knowledge base integration is the connection between an AI phone agent and a source of structured or unstructured information — product documentation,
- [Branded Caller ID](https://agents.bubblyphone.com/glossary/branded-caller-id): Branded caller ID is a verified display name, logo, and call reason that appears on a recipient’s phone when a business calls — replacing an unrecogni
- [AI Dialer](https://agents.bubblyphone.com/glossary/ai-dialer): An AI dialer is an outbound calling system that uses artificial intelligence to decide who to call, when to call, and how to handle the conversation o

## Guides

- [How to Build an AI Receptionist with BubblyPhone Agents](https://agents.bubblyphone.com/hub/how-to-build-ai-receptionist): Step-by-step guide to building an AI-powered phone receptionist that answers calls, books appointments, and routes inquiries.

## Blog

- [Local vs Toll-Free Numbers for AI Phone Agents: Which to Use When](https://agents.bubblyphone.com/blog/local-vs-toll-free-numbers-ai-phone-agents): The real difference between local and toll-free phone numbers for AI phone agents. Answer rate data, cost comparison, and when each type act
- [Sierra AI Alternative: When You Want the API, Not the Enterprise Contract](https://agents.bubblyphone.com/blog/sierra-ai-alternative-developer-api-no-enterprise-contract): Sierra is a well-funded enterprise customer service AI with outcome-based pricing starting around $150K/year. For teams that want a phone ag
- [Retell AI Alternative: A Developer's Honest Comparison](https://agents.bubblyphone.com/blog/retell-ai-alternative-developer-comparison): Looking for a Retell AI alternative? An honest comparison of pricing, developer experience, features, and the specific cases where each plat
- [Kore.ai Alternative: When to Pick Something Lighter](https://agents.bubblyphone.com/blog/kore-ai-alternative-when-to-pick-something-lighter): Kore.ai serves large enterprises with heavy compliance needs. For most teams, a lighter alternative is a better fit. Here is how to decide.
- [DTMF vs Voice Recognition: When to Use Each for AI Phone Agents](https://agents.bubblyphone.com/blog/dtmf-vs-voice-recognition-ai-phone-agents): When to use DTMF keypad input versus voice recognition in AI phone agents. A practical guide to the trade-offs, the hybrid pattern, and the 
- [Air.ai Alternative: Developer-First Voice AI Without the Pricing Mystery](https://agents.bubblyphone.com/blog/air-ai-alternative-developer-first-voice-ai): Looking for an Air.ai alternative with transparent pricing and a developer-first workflow? A practical comparison of what each platform offe
- [Bland AI Alternative: When a Simpler, Cheaper Developer API Wins](https://agents.bubblyphone.com/blog/bland-ai-alternative-simpler-developer-api): Bland AI is a strong voice agent platform, but tiered per-minute pricing and $299/$499 plan floors push developers to look for a simpler alt
- [Voiceflow Alternative: When You Outgrow the Flow Builder](https://agents.bubblyphone.com/blog/voiceflow-alternative-outgrow-flow-builder): Voiceflow is a solid visual agent builder, but voice calls burn credits fast and the flow paradigm breaks down on complex phone logic. Here 
- [Conversational AI Platforms: The 2026 Landscape and Who Should Use What](https://agents.bubblyphone.com/blog/conversational-ai-platforms-2026-landscape): A practitioner's guide to conversational AI platforms in 2026. Who leads, who is consolidating, and which category of platform fits which ki
- [Contact Center Automation Trends for 2026: What Actually Matters](https://agents.bubblyphone.com/blog/contact-center-automation-trends-2026): The AI hype era is over. Here are the contact center automation trends that actually matter in 2026: agentic AI, voice agents, CCaaS consoli
- [8 KPIs Every AI Outbound Calling Campaign Should Track](https://agents.bubblyphone.com/blog/8-kpis-every-ai-outbound-calling-campaign-should-track): The metrics that actually tell you whether your AI outbound calling campaign is working. Connection rate, qualification rate, conversion, an
- [Multilingual AI Voice Agents: What Works in 2026](https://agents.bubblyphone.com/blog/multilingual-ai-voice-agents-what-works-2026): A realistic look at multilingual AI voice agents in 2026. Which languages work well, which fall apart, and how to architect an agent that se
- [How AI Voice Bots Qualify Leads Automatically (and Where They Fail)](https://agents.bubblyphone.com/blog/how-ai-voice-bots-qualify-leads-automatically): A practical guide to automated lead qualification with AI voice agents. The right questions to ask, the scoring patterns that work, and the 
- [How to Buy an AI Phone Number: Providers, Pricing, and Pitfalls](https://agents.bubblyphone.com/blog/how-to-buy-an-ai-phone-number): A practical guide to buying a phone number for an AI voice agent. Provider comparison, pricing breakdown, country coverage, and the pitfalls
- [Is It Legal to Record Phone Calls? A 2026 State-by-State Guide](https://agents.bubblyphone.com/blog/is-it-legal-to-record-phone-calls-state-by-state-guide): Federal law allows one-party consent. 12 US states require all-party consent. Learn which states, how to stay compliant, and what it means f
- [Voice App Development: A Complete Guide to Building AI Phone Agents](https://agents.bubblyphone.com/blog/voice-app-development-guide-building-ai-phone-agents): A complete developer guide to building AI voice applications. Learn the architecture, tools, and step-by-step process for creating AI phone 
- [Amazon Lex vs Dialogflow: Which Voice AI Platform Should You Choose?](https://agents.bubblyphone.com/blog/amazon-lex-vs-dialogflow-voice-ai-platform-comparison): Compare Amazon Lex and Google Dialogflow for building voice AI applications. Pricing, NLU quality, integrations, and when to consider teleph
- [Backchanneling in Voice AI: Why the Small Sounds Matter](https://agents.bubblyphone.com/blog/backchanneling-voice-ai-why-small-sounds-matter): Backchanneling is why AI voice agents either feel human or feel broken. Learn what it is, the research behind it, and how to implement it in
- [ElevenLabs Alternative: Best Voice AI Platforms for Developers in 2026](https://agents.bubblyphone.com/blog/elevenlabs-alternative-best-voice-ai-platforms-developers): Looking for an ElevenLabs alternative? Compare voice AI platforms on quality, latency, pricing, and phone agent capabilities. Developer-focu
- [Text-to-Speech for AI Phone Agents: ElevenLabs vs Deepgram vs PlayHT](https://agents.bubblyphone.com/blog/text-to-speech-ai-phone-agents-elevenlabs-deepgram-playht): Compare text-to-speech providers for AI phone agents. ElevenLabs, Deepgram, PlayHT, and built-in model voices evaluated on quality, latency,
- [VoIP AI: How Artificial Intelligence Is Transforming Voice Communication](https://agents.bubblyphone.com/blog/voip-ai-artificial-intelligence-transforming-voice-communication): Discover how AI is reshaping VoIP with real-time voice agents, smart call routing, and automated conversations. Learn to build AI-powered vo
- [Call Analysis with AI: Extracting Insights from Every Phone Conversation](https://agents.bubblyphone.com/blog/call-analysis-ai-extracting-insights-phone-conversations): Use AI call analysis to extract transcripts, sentiment, outcomes, and actionable insights from every phone conversation. Developer guide wit
- [Warm Transfer vs Cold Transfer: Smart Call Routing for AI Agents](https://agents.bubblyphone.com/blog/warm-transfer-vs-cold-transfer-smart-call-routing-ai-agents): Learn the difference between warm and cold call transfers, how AI phone agents handle each, and how to implement smart call routing with a t
- [Voicemail Detection for AI Phone Agents: A Developer Guide](https://agents.bubblyphone.com/blog/voicemail-detection-ai-phone-agents-developer-guide): Learn how voicemail detection works for AI phone agents, why it matters for outbound campaigns, and how to handle answering machines program
- [Vapi Alternative: Comparing AI Phone Agent Platforms for Developers](https://agents.bubblyphone.com/blog/vapi-alternative-comparing-ai-phone-agent-platforms): Looking for a Vapi alternative? Compare AI telephony platforms on pricing, latency, flexibility, and developer experience. Honest side-by-si
- [What Is SIP Trunking? A Guide for AI Voice Applications](https://agents.bubblyphone.com/blog/what-is-sip-trunking-guide-ai-voice-applications): Understand SIP trunking and how it connects AI voice applications to the phone network. Learn the architecture, benefits, and when you need 
- [AI Outbound Calls: Build Automated Calling Campaigns with an API](https://agents.bubblyphone.com/blog/ai-outbound-calls-automated-calling-campaigns-api): Build AI outbound calling campaigns that scale. Learn how to automate sales calls, follow-ups, and surveys with a telephony API and your own
- [AI Cold Calling: How AI Phone Agents Are Replacing Manual Dialers](https://agents.bubblyphone.com/blog/ai-cold-calling-ai-phone-agents-replacing-manual-dialers): Learn how AI cold calling agents automate outbound sales calls, reduce costs, and scale faster than manual dialers. Build your own AI caller