For agencies
Add voice, SMS and call tracking — under your own brand.
Embed Callr’s voice, messaging and call-tracking features anywhere in your clients’ products, prove the ROI of every campaign, and ship it all white-label on a single REST API — across 220+ countries.
Maison Royale
Property experts
Handling 2.5 million calls daily for 300+ companies
Why agencies build on Callr
One API behind every client you serve
Three reasons agencies make Callr the communications layer under their products.
Voice & SMS, embedded
Drop voice, SMS and email interactions anywhere in your client’s product — click-to-call, callback forms, automated flows — across 220+ countries.
Call tracking that proves ROI
Attribute every call to its source, capture the data, and push it to your client’s CRM, analytics and BI — so your work is measurable.
Integrate in an afternoon
A clean, well-documented REST API with webhooks ready to use — no carrier contracts, no telecom headaches.
Voice & SMS
Integrate voice & SMS conversations
Callr’s REST API lets you add voice and messaging to your clients’ solutions in a few calls — inbound, outbound, and everything in between.
Get started for freeInbound & outbound, any channel
Connect callers however you like — click-to-call, callback forms, automated voice or SMS — in 220+ countries.
Custom IVR in low-code
Build scenarios with menus, conditional routing, transfers, voicemail, and SMS or email follow-up — no telecom expertise required.
Incoming call
Menu — sales or support
Route by region
Missed? SMS + email follow-up
Calls by source
Google Ads
+33 1 99 00 10 01
128 calls
Billboard
+33 1 99 00 10 02
84 calls
Radio
+33 1 99 00 10 03
52 calls
Revenue attributed
€48,200
Prove your value
Demonstrate ROI on every campaign
Capture the data behind every interaction and show your clients exactly what your work is worth.
Get started for freeCall tracking & attribution
Capture call origins, recordings and AI transcripts, and tie each call back to the campaign that drove it.
Track offline conversions
Assign a unique number to every offline source — billboards, TV, radio, print — and attribute the revenue each one brings in.
Developer-first
A transparent API your team will actually enjoy
Whatever the brief, Callr’s API makes it simple to ship custom communications, notifications and IVR flows for your clients.
Low-code & serverless
Build and deploy call flows fast with a serverless, low-code scenario engine — no infrastructure to run.
A toolbox of actions
Compose flows from a rich set of ready-made actions, tailored to each client’s exact need.
REST API & webhooks
A well-documented REST API and webhooks for everything that moves — ready to use from day one.
curl -X POST https://api.callr.com/calls \
-H "Authorization: Bearer ••••" \
-d '{
"to": "+33 1 99 00 10 01",
"scenario": "agency-ivr"
}'
Eva Carr
+33 6 39 98 12 34
Buying intent
HOT 🔥
Sentiment
Positive
AI highlights
Looking for an apartment in Paris near a metro — budget €600,000, open to more for the right place.
Synced to CRM
Salesforce · just now
AI
Turn conversations into data your clients can use
Let AI transcribe, summarize and enrich every call — then write the result straight into your client’s CRM.
Get started for freeTranscripts & recaps in seconds
Every call recorded, transcribed and summarized automatically — no manual notes.
Insights that matter
Extract sentiment, intent, satisfaction and more from every conversation, at scale.
Auto-populate the CRM
Contacts, summaries and outcomes land in Salesforce, HubSpot or your client’s stack the moment the call ends.
Integrations
Plug Callr into your clients’ martech stack
Every call, summary and outcome Callr captures flows straight into the CRM, analytics or BI tools your clients already run.
Get started for free
Google Ads
HubSpotSalesforceWhat our customers said
“Call tracking has grown our brand awareness and built real trust with our clients.”
Dassin Bidouzo
Chief Digital Officer, Bien’Ici
“We’ve worked with Callr from the beginning and grown together. Their responsiveness and an API that keeps evolving make all the difference.”
Yannick Fauchille
Co-founder & Business Lead
“We prove ROI to our clients easily, without digging through data sources by hand.”
Julien Balmont
Co-founder & CTO, Zenchef
Our infrastructure
We own our network
Callr isn’t a reseller. We run our own carrier network — so you get better performance, reach and support, straight from the source.
Global coverage
Order numbers in one click across 220+ countries — local, premium, vanity or toll-free.
Encrypted & secure
State-of-the-art encryption end to end, with HTTPS, SIP TLS and SRTP.
A network you can rely on
Multiple data centers and points of presence worldwide keep your clients’ calls connected.
Registered carrier
We operate our own network for better performance, localization and support.
Discover how Callr can help you get more from your conversations
From the first ring to the closed deal, put your clients’ voice and message data to work.
Customer experience
Use Callr’s API to engage your clients’ customers automatically, when and how they need it, at scale.
Learn more →Sales enablement
Identify high-value callers, hand sales the full context, and help your clients close more deals.
Learn more →Data Intelligence
Analyze every voice and message conversation with AI and surface crucial insight about your clients’ customers.
Learn more →