Phone StackPhone Stack

Powerful Features for Inbound Call Centers

Everything you need to answer every call, help every caller, and never miss an opportunity.

AI Training Chat

Train your AI agent by having a conversation, not filling out forms. Describe your customer workflows, support processes, and goals — Phone Stack learns your communication style and adapts.

  • Natural conversation-based training
  • Learns your service workflows and talking points
  • Refine and iterate with follow-up chats

Document Intelligence

Upload knowledge bases, policy docs, billing FAQs, and product documentation. Phone Stack extracts key information and uses it during calls to answer questions accurately.

  • PDF, DOCX, and TXT support
  • Automatic extraction of policies, pricing, and procedures
  • AI references your docs in real-time during calls

Voice Selection

Choose from multiple natural-sounding voice options. Each voice has been fine-tuned for customer conversations — professional, warm, and engaging.

  • Multiple male and female voices
  • Adjustable speaking speed and tone
  • Custom voice cloning on Enterprise plans

Bot Detection Handling

Configurable behavior when asked "Are you a robot?" Phone Stack can disclose, deflect, or handle the question according to your preferences and compliance requirements.

  • Customizable disclosure scripts
  • Natural deflection responses
  • Compliance-first configuration

Live Dashboard

Watch your calls in real time. See active calls, streaming transcripts, and live metrics. Jump in to monitor any conversation.

  • Real-time call status and metrics
  • Live streaming transcripts
  • Active call monitoring

Call Recording & Transcription

Every call is automatically recorded and transcribed. Search through transcripts, replay calls, and review exactly what was said.

  • Full HD audio recording
  • Accurate AI transcription
  • Searchable transcript archive

AI Call Summaries

Get auto-generated summaries for every call — key topics discussed, customer sentiment, issues raised, and resolution status with follow-up actions.

  • Automated call disposition
  • Sentiment analysis
  • Resolution tracking and follow-up actions

Customer Q&A Handling

Define custom responses to common customer questions and concerns. Train the AI with your best answers and watch it handle inquiries naturally.

  • Custom question-response pairs
  • Context-aware response selection
  • Continuous improvement from call data

Compliance Tools

Built-in compliance workflows to keep you covered. Consent management, AI disclosure, automatic opt-out handling, and a full audit trail.

  • Consent tracking and management
  • AI disclosure configuration
  • Automatic opt-out list and audit trail

Analytics & Reporting

Track answer rates, resolution rates, cost per contact, and performance. Identify what's working and optimize your strategy with data.

  • Answer rate and connection tracking
  • Resolution and outcome visualization
  • Cost per contact and performance metrics

Listen Live & Barge In

Supervisors can listen to live calls in real time and barge in to take over the conversation when needed. Full visibility and control over every AI interaction.

  • Real-time audio monitoring of any active call
  • One-click barge-in to take over from AI
  • Supervisor dashboard with live call list

Dynamic Emails & Calendar Events

Send emails and create calendar invites with any dynamic fields, personalized links, and context from the call. Confirmations, follow-ups, or documents — all automatic.

  • Dynamic field interpolation (name, account, custom fields)
  • Personalized links and attachments
  • Calendar invites with call context included

Native Integrations

Connect to HubSpot, Mailchimp, and Zapier with one click. Sync contacts, log calls to your CRM, tag email subscribers by outcome, and trigger AI calls from any workflow.

  • HubSpot: CRM sync, call logging, workflow-triggered calls
  • Mailchimp: disposition tags, nurture automations, call non-openers
  • Zapier: connect to 7,000+ apps with triggers and actions

Full API (In & Out)

Complete REST API for inbound and outbound workflow integration. Trigger calls, receive webhooks, sync data, and build any custom workflow on top of Phone Stack.

  • Trigger outbound calls and campaigns via API
  • Receive real-time webhooks for call events
  • Sync contacts, outcomes, and recordings with any system

Call Routing Builder

Design intelligent call flows that route callers based on intent, time of day, department, or custom rules. AI understands what callers need and sends them to the right place.

  • Intent-based routing from natural conversation
  • Time-of-day and business-hours rules
  • Department and skill-based routing

Toll-Free & Vanity Numbers

Get toll-free or vanity numbers that customers remember. Route multiple numbers to different AI profiles for different business lines.

  • Toll-free, local, and vanity number options
  • Per-number AI profile assignment
  • Multi-line support for different departments

Appointment & Meeting Booking

Callers book, reschedule, or cancel appointments directly on the call. AI checks availability in real time and sends calendar invites automatically.

  • Calendly and Google Calendar integration
  • AI-suggested available time slots
  • Automatic confirmation emails and SMS

Human Escalation

When a caller needs a real person, AI transfers seamlessly with full context. No caller has to repeat themselves. Define escalation rules by topic, sentiment, or request.

  • Warm transfer with call summary to agent
  • Configurable escalation triggers
  • Fallback to voicemail when agents unavailable

24/7 Availability

Never miss a call. AI handles after-hours, weekends, and holidays. Every caller gets a professional, helpful response — any time of day.

  • Always-on AI with no downtime
  • After-hours message taking and routing
  • Holiday schedule configuration

Knowledge-Base Answers

AI references your uploaded docs, FAQs, and policies to answer caller questions accurately — just like your best support agent, but available 24/7.

  • Real-time document retrieval during calls
  • Policy and pricing lookup
  • Continuous learning from new documents

Voicemail & Message Taking

When callers prefer to leave a message, AI captures their intent, contact info, and urgency. Messages are transcribed, summarized, and routed to the right team.

  • Intent-aware message capture
  • Urgency detection and priority routing
  • Transcribed and summarized for your team

Caller ID & Verification

Identify returning callers, verify account information, and personalize the experience. AI adapts its approach based on caller history and status.

  • Caller ID lookup and matching
  • Account verification workflows
  • Personalized greetings for returning callers