Discover Callr’s Powerful Features - Enhance Your Communications

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AI

AI-powered call intelligence: automatic transcription, sentiment analysis, intent detection, keyword tracking, data extraction with LLMs, and conversational AI agents — all built into Callr Actions.

Audio & Recording

Record, transcribe, and manage call audio. Text-to-speech and speech recognition in multiple languages. Audio file library for IVR prompts and hold music.

Analytics

Comprehensive call analytics: CDR capture, source attribution, geographic tracking, GA4 and Mixpanel integrations, unique caller deduplication, and full API access for custom reporting.

SMS

Send and receive SMS globally with custom sender IDs, delivery reports, encoding support, compliance tools, and integrations. Short codes, long numbers, and two-way messaging.

Programmable voice

Build voice applications with Callr Actions — a YAML-based framework for IVR, call routing, real-time control, conferencing, data integration, and workflow automation. No servers required.

Carrier

Callr's own carrier-grade network: SIP/IAX trunking, global number provisioning, encrypted connectivity, and multi-POP infrastructure across US, Asia, and Europe.

Live Debugger

Debug call flows in real time with step-by-step visibility into action execution, variable states, webhook payloads, and error traces. Inspect every decision point as calls flow through your application.

Connect to ElevenLabs

Connect callers to ElevenLabs' Conversational AI through native SIP integration. Combine ElevenLabs' ultra-realistic voice synthesis and conversational AI with Callr's carrier-grade telephony infrastructure.

Connect to Vapi

Bridge callers to Vapi's voice AI platform through native SIP integration. Combine Vapi's conversational AI agent framework with Callr's carrier-grade telephony, call recording, and real-time webhooks.

Connect to OpenAI Realtime

Connect callers directly to OpenAI's Realtime API for natural, low-latency voice AI conversations. Use dial@v1 to bridge calls to OpenAI's SIP endpoint with full call control and recording.

Caller ID Management

Control and customize the caller ID displayed on outbound calls with verified numbers and dynamic CLI management via API. Boost answer rates with local presence dialing.

OAuth Integrations

Secure token-based authentication with granular OAuth scopes to control exactly which resources each integration can access. Manage access tokens, refresh tokens, and authorization flows for third-party applications.

AI Data Extraction

Extract structured information from voice conversations automatically using openai@v2 and javascript@v1 actions. Capture names, addresses, order numbers, preferences, and any custom field — push to your systems via fetch@v2 in real time.

Voice Broadcasting

Send pre-recorded voice messages to thousands of recipients simultaneously. Trigger campaigns via API using say@v2 with TTS or audio files. Real-time delivery tracking, response capture via gather@v2, and automated retry management.

Call Tracking

Track marketing-driven calls with dynamic number pools and source attribution. Assign unique numbers per campaign, channel, or visitor session. Full CDR capture with source, medium, and keyword data pushed to your analytics stack via fetch@v2.

X CONNECT DATA CENTER

Callr's infrastructure is interconnected via X-Connect, providing direct cross-connects to major carrier exchanges and internet peering points for minimal latency and maximum reliability.

Interactive Voice Response (IVR)

Build multi-level IVR trees with YAML-based Callr Actions. Route calls by CLI, dialed number, time of day, or DTMF input. Supports TTS prompts, audio playback, queue management, and real-time data lookups.

DTMF

Collect and send DTMF tones during calls. Build "Press 1" menus with the gather@v2 action or send tones programmatically with dtmf@v1. Supports multi-digit input, timeouts, and termination keys.

Click to Call

Connect two phone numbers with a single API call. Callr initiates an outbound call to the first party, then bridges to the second using dial@v1 and bridge@v1. Supports web-initiated calls, lead callbacks, and agent-to-customer connections.

In & Out Conferencing

Bridge multiple call legs into a single conference session. Add or remove participants dynamically during a live call. Supports whisper messages, recording, and moderated conferences via Callr Actions.

Voicemail detection

Detect answering machines and voicemail systems using the amd@v2 action. Branch your call flow based on whether a human or machine answers. Configurable detection sensitivity and timeout parameters.

Multi-Channel AI Agents

Build conversational AI agents with voicebot@v1. Real-time speech recognition, LLM-powered reasoning with OpenAI-compatible models, HTTP tool calling for calendar booking and CRM updates, and automatic follow-up via SMS and email — all defined in a single YAML scenario.

Keywords

Extract keywords and topics from call transcripts using openai@v2. Send custom prompts to OpenAI, Claude, or Mistral and receive structured JSON responses. Results are pushed to your backend via fetch@v2 in the hangup branch.

Sentiment Analysis

Analyze caller sentiment from transcripts using openai@v2 with any OpenAI-compatible LLM. Detect frustration, satisfaction, and urgency with custom prompts. Results delivered as structured JSON to your CRM or analytics platform via fetch@v2.

Intent Detection

Classify caller intent from transcripts using openai@v2. Define custom intent taxonomies via prompts — purchase, support, booking, complaint, or any business-specific categories. Structured JSON output pushed to your systems via fetch@v2.

Call Transcription

Automatically transcribe calls with speaker diarization using startRecording@v1. Generate searchable text from every conversation. Feed transcripts to AI for summarization, intent detection, and data extraction.

Audio Library

Upload and manage audio files for use in call flows. Play hold music, pre-recorded prompts, IVR menus, and branded greetings with the play@v1 action. Supports MP3 and WAV formats. Organize in folders via Portal or API.

Multilingual Speech recognition

Recognize spoken input in multiple languages with the recognize@v2 action. Convert caller speech to text for voice-driven IVR menus, natural language commands, and real-time transcription during calls.

Multilingual Text to Speech

Convert text to speech in multiple languages with the say@v2 action. Select language, voice gender, and accent. Use for IVR prompts, announcements, dynamic messages with caller-specific data, and voicemail greetings.

Call recordings

Record inbound and outbound calls with startRecording@v1. Automatic transcription, cloud storage, and on-demand playback. Recordings accessible via API, webhook, or Portal. Configurable retention policies.

Unique Callrs

Identify unique callers across all your tracking numbers. Deduplicate repeat callers to get accurate lead counts. Track first-time vs. returning callers for conversion analysis and campaign optimization.

Call geographic origins

Identify the geographic origin of each caller based on their phone number. Get country, region, and city-level data when available. Use for routing, analytics, and compliance decisions during or after calls.

Call duration

Precise call duration tracking for every call, broken down into ring time and talk time. Available in CDR data, real-time webhooks, and the Portal dashboard. Use for billing, SLA monitoring, and agent performance.

API Integration

Full REST API with SDKs for PHP, Node.js, Python, and Ruby. Manage numbers, deploy scenarios, initiate calls, send SMS, export CDRs, and configure webhooks — all programmatically. OpenAPI spec available.

Mixpanel Integration

Push call events to Mixpanel using the built-in mixpanel@v1 action. Track call interactions as Mixpanel events with user properties, enabling funnel analysis and cohort tracking across voice channels.

Google Analytics Integration

Push call events to Google Analytics 4 as conversions using the built-in googleAnalytics@v1 action. Track calls as GA4 events with custom parameters: source, campaign, duration, outcome, and caller location.

Sources

Track the marketing source of every call. Attribute calls to campaigns, channels, keywords, and landing pages. Measure ROI across paid search, organic, social, and offline sources with per-call granularity.

Call Detail Record (CDR)

Comprehensive Call Detail Records for every call. Captures caller/callee numbers, line type, geographic origin, precise call timeline, hangup party, duration, cost, and DTMF keypresses. Export via API or push in real-time.

Data capturing

Capture and parse structured data from inbound SMS messages. Extract keywords, codes, responses, and customer information. Route parsed data to your CRM, database, or analytics platform via webhooks.

CRM Integration

Native OAuth integrations with Salesforce, HubSpot, Google, and Microsoft. Access tokens are usable directly in fetch@v2 to push call data, recordings, transcriptions, and AI analysis to your CRM in real-time — no middleware required.

Webhooks

Receive real-time HTTP POST notifications for call events, SMS delivery reports, and billing alerts. JSON payloads with full event context. Configure per-scenario or globally via the API.

DLR

Delivery Reports (DLR) for every SMS sent. Track message status in real-time: delivered, failed, pending, expired. Receive DLRs via webhook for automated delivery tracking and retry logic.

GSM & UNICODE Support

Full GSM 7-bit and Unicode (UCS-2) encoding support for SMS. Send messages in any language — Latin, Cyrillic, Arabic, CJK, emoji. Automatic encoding detection and multi-part message handling.

Alerting & Marketing Compliance

Built-in compliance tools for SMS marketing regulations. Opt-in/opt-out management, TCPA and GDPR compliance, sending rate controls, and quiet hours enforcement to keep your messaging compliant.

Long Virtual Numbers

Dedicated long virtual numbers (10-digit format) for two-way SMS conversations. Local presence in target markets, reply capability, and lower cost than short codes. Ideal for transactional and conversational messaging.

Short Code

Dedicated short codes (4-6 digit numbers) for high-throughput SMS campaigns. Higher sending rates, better deliverability, and carrier-approved for marketing and transactional messaging.

Custom Sender

Send SMS with custom alphanumeric or numeric sender IDs in 200+ countries. Display your brand name or a local number as the sender. Country-specific registration handled by Callr.

Outbound

Send SMS globally from custom sender IDs via the REST API or sms@v1 action within call flows. Support for transactional, notification, and marketing messages. Delivery reports (DLR) for every message.

Inbound

Receive SMS on dedicated virtual numbers. Process inbound messages via the inbound-sms branch in Callr Actions. Parse content, trigger workflows, auto-reply, or forward data to your backend in real-time.

No-Code Automation

Connect Callr to 5,000+ apps via Zapier, Make.com, and direct webhooks. Call events, SMS, CDR, recordings, and AI analysis trigger automations in your existing stack — no code required.

Inbound & Outbound Calls

Handle both inbound and outbound calls on the same platform. Smart routing optimizes call paths for quality and cost. Volume-based pricing that decreases as your traffic grows. Full CDR capture on every call.

Global Numbers provisioning

Provision phone numbers in 80+ countries instantly via the Portal or REST API. Geographic, toll-free, and mobile number types. Each number is assignable to a Callr Actions scenario for programmable call handling.

Data push

Push call data to your backend in real-time using fetch@v2. Send CDRs, recordings, transcriptions, and AI analysis results to your CRM, data warehouse, or any HTTP endpoint at call completion.

Data fetch

Fetch external data in real-time during a live call using fetch@v2. Query your CRM, database, or any HTTP API to personalize call routing, greetings, and agent assignments based on caller context.

Business & Opening hours handling

Route calls based on business hours, holidays, and custom schedules. Define opening hours per day of week, set holiday overrides, and branch to voicemail or alternate routing outside business hours — all in YAML.

Low-code scripts

Design call flows with Callr Actions — a declarative, YAML-based framework inspired by GitHub Actions. Build IVRs, routing logic, recordings, AI integrations, and data pipelines without managing servers.

E-mail & SMS Notifications

Trigger email and SMS notifications directly from call flows using email@v1 and sms@v1 actions. Send call summaries, appointment confirmations, alerts, and transactional messages — no external service required.

Secure & Encrypted

End-to-end encryption for voice traffic with TLS (signaling) and SRTP (media). HTTPS-secured APIs. All data encrypted at rest and in transit. EU-hosted infrastructure with GDPR compliance.

Registered carrier

Callr is a registered telecom carrier (ARCEP in France, FCC-compliant in the US). We operate our own network infrastructure, ensuring direct control over quality, compliance, and routing — no middlemen.

Real time control

Full real-time control over active calls via API. Modify call flows on the fly: reroute, add participants, play audio, collect input, and terminate — all while the call is live.

Global footprint

Callr operates its own carrier network with 2 virtual POPs (USA, Singapore) and 2 physical racks in France on dedicated fiber. Direct peering with Tier 1 carriers for low-latency, high-reliability voice paths.

Global reach

Provision local inbound numbers in 80+ countries and route outbound calls to 220+ destinations. Instant number activation via Portal or API with geographic, toll-free, and mobile number types.

SIP Trunking & IAX

Enterprise-grade SIP and IAX trunking with TLS/SRTP encryption, elastic channel scaling, instant provisioning, and direct carrier interconnections. Compatible with Asterisk, FreeSWITCH, Vicidial, FreePBX, and any standards-compliant PBX.