The complete UCaaS phone system.On a cellular eSIM.Not a softphone.
Auto-attendant, multi-level IVR, hunt groups, departments, call queuing, voicemail with transcripts, recording, analytics, CRM integrations — every UCaaS feature you'd expect from RingCentral, Dialpad, 8x8, Vonage Business, or Nextiva. Running end-to-end on a real cellular eSIM line. PSTN-native. No softphone in the path.
United States · 1–50 seats · Activates in ~5 minutes · Bring your number
The full UCaaS platform.A different delivery.
Kelir is a Unified Communications-as-a-Service platform — the same product category as RingCentral, Dialpad, 8x8, Vonage Business, Nextiva, GoTo Connect, and Zoom Phone. The full enterprise call-handling stack: auto-attendant, multi-level IVR, hunt groups, departments, call queuing, music on hold, shared voicemail, voicemail with transcripts, call recording with configurable retention, working-hours routing, holiday overrides, do-not-disturb, call forwarding, two-way SMS and MMS, analytics dashboards, CRM integrations, admin portal with role-based access.
What's different is the delivery layer underneath. Every other UCaaS vendor ships this feature set as a softphone — a mobile or desktop app that registers to a SIP server over Wi-Fi or mobile data and carries voice as packets through that connection. Kelir ships it on a real cellular eSIM line. The eSIM is provisioned from a US carrier (Telnyx) directly to the user's phone, alongside their personal SIM. Calls ride the cellular voice network end-to-end. The native dialer rings. The Kelir mobile app is a control panel for the system, not the voice path.
The result is a PSTN-native business phone system with the depth of a UCaaS platform on top. Bad Wi-Fi, suspended apps, dropped audio on network handoff, 2FA SMS being rejected as virtual — none of those softphone failure modes apply. And the same admin portal, the same IVR builder, the same analytics, the same CRM integrations as any other UCaaS vendor's stack still live on top, configurable from the web.
Every UCaaS capability.Categorized.
The full feature surface, grouped by what it does. Plan availability marked on each feature — see /pricing for the side-by-side matrix. If RingCentral or Dialpad ships it, Kelir ships it.
Inbound call handling
The full UCaaS-tier inbound stack. Auto-attendant, multi-level IVR menus, hunt groups, departments, call queuing, working-hours routing — the same call handling layer RingCentral, Dialpad, 8x8, and Vonage Business ship. Configure in the admin portal; calls land on a native dialer ring.
Auto-attendant
Type a greeting, preview the AI voice, activate. Greet every caller with the right message — by hour, day, or holiday. Skip the menu when the caller is a known VIP.
Multi-level IVR
Press 1 for sales, 2 for support, then sub-menus for each. Up to 4 levels deep on Team Pro. Time-of-day branches and holiday overrides. Every node configurable from the portal.
Hunt groups
Sequential, simultaneous, or round-robin. Distribute inbound calls across a team — sales line rings the whole desk; on-call rings the rotation in order. Catcher voicemail when nobody picks up.
Departments
Sales, Support, Finance — each with its own US business number, working hours, voicemail, hunt group, and routing rules. The call lands in the right place without a human gatekeeper.
Call queuing
Callers wait with music on hold instead of bouncing to voicemail. Position-in-line announcements, max-wait fallback to voicemail, abandon-rate tracked in analytics.
Music on hold
Default catalog or upload your own audio. Per-department or company-wide. Optional pre-roll message before the music plays.
Skill-based routing
Tag agents with skills (Spanish-speaking, enterprise-tier, billing-trained), tag inbound calls (CRM lookup, IVR selection, caller history), match the right agent to the right call. Falls back to standard hunt group if no skill match.
Call screening
Whisper announcement plays for the agent before connecting — "Inbound from Sales line, Mark Reeves." Decide to take, send to voicemail, or transfer without the caller hearing.
Caller ID & CNAM
Inbound shows the caller's number and submitted CNAM. CRM lookup overlays the contact name and last interaction at ring time on Team Pro.
Outbound calling
Place calls from the native dialer using your business caller ID. Click-to-call from the CRM, intra-company free, and outbound caller-ID per department.
Outbound on the native dialer
Open the iPhone Phone app or Android dialer, switch the line selector to Kelir, place the call. The recipient sees your business number. Same UI as your personal line.
Click-to-call from CRM
Click any phone number in HubSpot, Salesforce, or Pipedrive to dial it through Kelir. The call logs back to the CRM record automatically with duration and recording link.
Internal calls free
Calls between Kelir lines on the same account go SIM-to-SIM at zero interconnect cost. Inter-team calls don't show up on a usage bill — they're free across the directory.
Outbound caller-ID per department
Sales calls go out as the sales line. Support calls go out as the support line. Configurable per user, per department, per call. The recipient never sees a personal cell number.
Messaging — SMS & MMS
Two-way SMS and MMS on a real cellular number, A2P 10DLC pre-registered for business deliverability. Group threads, media attachments, scheduled sends.
Two-way SMS
Send and receive on your business number. Threads in the Kelir app and (on iOS) in the Messages app via Business Messaging. Group SMS supported.
MMS — photos, video, documents
Send and receive media up to 1 MB on standard MMS, 5 MB via Business Messaging fallback. Quote photos for contractors, scan-and-send for clinics, contract PDFs for agencies.
A2P 10DLC pre-registered
Business-volume SMS doesn't get carrier-blocked. We handle the brand registration with The Campaign Registry; you just send messages.
Templates & saved replies
Save common responses ("Confirmed for Tuesday at 2pm — see you then"), insert with one tap. Per-user templates plus shared team library on Team plans.
Voicemail & call recording
Voicemail with email-delivered transcripts on every line. Per-user inboxes plus shared department voicemail. Call recording on-demand or always-on, encrypted at rest, configurable retention.
Voicemail per user
Personal voicemail box for every Kelir line. Custom greeting, audio + transcript delivered by email at message time, replay or delete from the app.
Shared department voicemail
Sales line missed-calls land in a shared inbox the whole team can see. Mark as read, assign to a teammate, reply by SMS or callback.
Voicemail transcription
Every voicemail arrives as both audio and accurate text. Read at a glance from the lock-screen email; decide to call back tonight or tomorrow without listening.
Call recording
On-demand (press a key to start) or always-on per user or company-wide. AES-256 at rest in AWS US-East-1, downloadable as MP3, optional consent disclosure prompt at call start.
Configurable retention
Default retention 1 year for recordings, 90 days for voicemail. Configurable from 30 days to 7 years on Team Pro for compliance use cases.
Consent-aware recording
Configurable disclosure prompt plays at the start of recorded calls. You're responsible for one-party vs two-party consent in your jurisdiction; Kelir provides the tooling.
Working hours & availability
Real boundaries. Work hours per user and per department. Holiday overrides. Per-caller do-not-disturb that lets the people who always get through actually get through.
Working-hours routing
Per-day schedules (Mon–Fri 9–6, Saturday 10–2, Sunday closed). In-hours rings; out-of-hours routes to a custom voicemail or after-hours number.
Holiday overrides
Mark Memorial Day, Thanksgiving, the long weekend in November. Custom greeting plays, calls route to the right place, you don't update anything that day.
Do-not-disturb
Manual toggle from the lock screen, scheduled (every weekday 6pm–9am), or rule-based (during meetings via calendar integration). Allow-list for VIPs.
Call forwarding
Forward to any number — your personal cell, an answering service, a colleague. Conditional (only when busy / only after-hours / always) or unconditional.
Admin portal & user management
The admin surface lives at app.kelir.io — a web portal where the office manager runs the system without touching a phone. User management, eSIM assignment, IVR builder, routing rules, recording downloads, billing.
User management
Add, remove, suspend users. Assign roles (admin / standard). Bulk invite by CSV. Self-serve onboarding URL with eSIM activation per user.
eSIM assignment & reset
Push a fresh eSIM to a user's phone, transfer between devices, reset on lost-phone. No physical SIM to ship; everything happens in the portal.
Visual IVR builder
Drag-and-drop multi-level IVR tree. Test each path with a phantom call before activating. Versioned — roll back to last week's flow if Friday's update breaks something.
Call logs & CDRs
Every inbound and outbound call with timestamp, duration, route taken, recording link. Filter by user, department, time range, call result. Export CSV.
Role-based access control
Admin sees everything. Standard user sees their own line, voicemail, recordings. Departmental managers can be granted read-only access to a department's logs.
Audit log
Every admin action logged: who changed the IVR, who downloaded a recording, who suspended a user, when. Exportable for compliance reviews.
Analytics & reporting
Personal call data on Solo. Team-level analytics on Team. CRM-correlated activity reports on Team Pro. Built for the question "are we picking up enough calls?" and "which lines are over capacity?"
Call volume by user / department
Inbound, outbound, missed, by hour-of-day or day-of-week. See which sales rep is fielding the most calls, when support gets slammed, where the office is light.
Missed call rate & answer rate
Trended weekly. Drill into which lines, which time blocks. Critical for service-business operators measuring whether the phone is actually getting picked up.
Average call duration
By user and department. Useful for sales coaching (long calls correlate with closes), for support (short calls correlate with quick resolution or rushed agents).
Peak hours heatmap
Visualize when the phone rings most. Staff the desk based on data, not anecdote. Correlate marketing campaigns to call spikes.
CRM activity reports
Calls and SMS synced to CRM contact records. Pipeline-stage call counts, account-level activity timelines, deal-velocity correlations.
CRM integrations
First-class integrations with HubSpot, Salesforce, and Pipedrive on Team Pro. Calls and SMS sync as activities. Click-to-call from CRM. Caller-ID lookup overlays contact context at ring time.
HubSpot · Salesforce · Pipedrive
OAuth-connect once. Calls and SMS log to the contact record. Click-to-call from any phone field. Recording links appear on the activity. Caller-ID lookup runs on inbound — see the contact card before you pick up.
Webhooks for everything else
Outbound webhooks fire on call started, call ended, voicemail received, SMS sent. Wire into Zapier, Make, or your own backend for custom workflows.
Public API (Phase 3)
Programmatic access to numbers, users, call history, IVR config, and webhooks. Currently in private alpha; broader access opens Phase 3.
Cellular delivery — what makes Kelir different
RingCentral and Dialpad ship the same call-handling features. The difference is delivery: they run as softphone apps over Wi-Fi or data; Kelir runs end-to-end on the cellular voice network through an eSIM. The call is a real cellular call. The call-handling layer is the UCaaS feature surface.
Real cellular eSIM
An actual eSIM profile from Telnyx, provisioned in <5 minutes via direct push (iPhone) or QR (Android). Lives alongside your personal SIM. Native VoLTE HD voice on the cellular voice network.
Native dialer rings
Inbound calls land on iPhone Phone or the Android dialer. Lock-screen ring. Same UI as your personal line. The Kelir mobile app is a control panel — never a softphone.
No internet needed for calls
Bad Wi-Fi, hotel networks, basements with no connectivity — none of it matters. Voice runs on cellular VoLTE. The softphone failure modes — app suspended, audio bound to bandwidth, dropped on Wi-Fi handoff — don't apply.
CarPlay, Apple Watch, lock screen
Routes through CarPlay automatically, registered Bluetooth, Apple Watch — same as a personal cellular line. Call blocking, screening, and contact integration all apply.
2FA SMS reliably accepted
Real US cellular number means banks, payment platforms, government services accept it for 2FA the same way they accept a personal cell. Virtual VoIP numbers are increasingly blocked.
International via Wi-Fi calling
Your US Kelir number rings overseas via Wi-Fi calling on supported devices — no roaming charge from Kelir. Pair with any travel eSIM for data abroad; Kelir continues to ring on the device.
SIM-swap resistant
eSIM has no physical card to socially-engineer out of a carrier. Account changes require admin auth in the Kelir portal; carriers can't transfer your number through a phone-store interaction.
Security, compliance & trust
Encrypted in transit and at rest. US data residency. SOC 2 Type II on the roadmap. E911 enabled. HIPAA-aware architecture (BAA on roadmap for Team Pro).
Encryption — TLS 1.3 + AES-256
All API traffic over TLS 1.3. All voicemail audio, recordings, and transcripts encrypted at rest with AES-256, KMS-managed keys in AWS US-East-1.
US data residency
All call metadata, voicemail audio, transcripts, and recordings stored in AWS us-east-1. No offshore processing. AWS Business Associate Addendum on the underlying infrastructure.
SOC 2 Type II — roadmap
Architecture is consistent with SOC 2 controls (access logging, retention, encryption, separation of duties). Type II audit on the roadmap; report available on request when complete.
E911 — required, enabled
Emergency calls route to the appropriate PSAP based on registered address. Required by FCC for any business phone service in the US — enabled on every Kelir line.
Access logging & audit trail
Every admin action — IVR change, recording download, user suspension — logged with actor, timestamp, and prior state. Exportable for compliance reviews.
FCC + A2P 10DLC compliant
Brand registered with The Campaign Registry. Carrier interconnect through Telnyx (compliant US carrier). E911, KYC, port-out rules, and consumer disclosures all aligned to FCC requirements.
Inbound, in plain order.From caller to native dialer.
A customer dials the company main number. Here's every layer the call passes through before it lands on a teammate's lock screen.
- 01
Inbound to Kelir cloud
Telnyx-carrier interconnect receives the PSTN call on the company DID. The call enters the Kelir routing platform.
- 02
Auto-attendant / IVR
Greeting plays. Caller selects sales / support / billing or speaks the option (multi-level IVR on Team). Time-of-day and holiday rules apply.
- 03
Hunt group / department
Routing engine selects the destination — sequential, simultaneous, or round-robin across the group. Skill-match on Team Pro.
- 04
Cellular ring on the user's eSIM
The selected user's eSIM rings via VoLTE. Native dialer surfaces the call on the lock screen. Caller-ID + CRM-lookup overlay shows context.
- 05
Call screening (optional)
Whisper announcement plays for the agent before connecting. Decline-to-voicemail or accept.
- 06
Connected — recording (if enabled) starts
Recording with optional consent disclosure. Audio runs end-to-end on cellular. Transcription queued for after-call.
- 07
After-call: log + recording + transcript
Call logged to CDR. Recording stored encrypted. Transcript generated. Activity synced to CRM (Pro).
- 08
Missed: voicemail with transcript
If unanswered after the configured timeout, voicemail records. Audio + transcript delivered by email immediately.
Every step from 01 to 04 happens in the Kelir routing platform — the UCaaS layer. Step 04 onward happens on the user's actual cellular eSIM line. That's the split that makes Kelir what it is: the routing depth of a UCaaS platform with the call quality and reliability of a real cellular line.
The same features.A real cellular line.
What makes Kelir a different product class than RingCentral or Dialpad isn't the feature set — those vendors ship a comparable surface. It's that the call itself runs on the cellular voice network, not over Wi-Fi or mobile data through a softphone.
The eSIM provisions from Telnyx in under five minutes. The native dialer rings. The call carries on VoLTE HD voice the same way a personal cellular line carries. The Kelir app is a control panel — never a softphone. Apps don't need to be open for calls to come through.
- Native dialer rings on iPhone and Android — same lock-screen UI as personal calls
- Voice runs on cellular VoLTE — no Wi-Fi or data needed, no softphone in the path
- Real US cellular number — accepted by banks, payment platforms, government for 2FA SMS
- CarPlay routes automatically — registered Bluetooth, Apple Watch, all native
- Works in basements, on job sites, in the car, anywhere personal cellular works
- Multiple eSIM profiles supported — Kelir lives alongside personal SIM on the same phone
- App-suspended, app-uninstalled, OS-updated — none of it affects whether calls ring
- SIM-swap resistant — eSIM has no physical card to socially-engineer at a phone store
Built for regulated work.From day one.
Encryption in transit and at rest. US data residency in AWS us-east-1. SOC 2 Type II on the roadmap. E911 enabled. HIPAA-aware architecture with BAA on the roadmap for Team Pro. FCC + A2P 10DLC compliant.
Encryption
TLS 1.3 in transit. AES-256 at rest, AWS KMS-managed keys. Voicemail audio, recordings, transcripts all encrypted.
US data residency
All call metadata, audio, recordings, transcripts in AWS us-east-1. No offshore processing.
Access logging
Every admin action logged. Audit trail exportable. Role-based access control on Team plans.
E911 — enabled
Emergency calls route to PSAP based on registered address. Required by FCC; live on every Kelir line.
SOC 2 — roadmap
Architecture consistent with Type II controls. Audit on the roadmap; report on request when complete.
HIPAA-aware
Architecture supports HIPAA-grade controls; customer-facing BAA on the Team Pro roadmap.
One product.Three plans.
The product is the same. The plans are how it's bundled and priced for different buyer sizes. Solo for one-person businesses, Team Starter for multi-user PBX needs, Team Pro for CRM-integrated and compliance-led workflows.
Kelir Solo
The full single-user system. Auto-attendant, working hours, voicemail with transcripts, recording, SMS — every feature included. One business number on a cellular eSIM.
Kelir Team Starter
Everything in Solo per seat — plus the multi-user PBX layer: hunt groups, multi-level IVR, departments, call queuing, shared voicemail, admin portal, team analytics.
Kelir Team Pro
Everything in Team Starter — plus CRM integrations (HubSpot, Salesforce, Pipedrive), skill-based routing, audit log, configurable retention, priority support, SOC 2 Type II report on request.
See the full feature matrix, plan-by-plan, on /pricing.
Common questions
Positioning, delivery, devices, compliance, plans. The questions buyers ask before they sign up.
Kelir is the complete UCaaS phone system — the same call-handling platform RingCentral, Dialpad, 8x8, Vonage Business, and Nextiva sell — delivered on a real cellular eSIM line instead of as a softphone app. Auto-attendant, multi-level IVR, hunt groups, departments, call queuing, voicemail with transcripts, recording, analytics, CRM integrations — all running end-to-end on the cellular voice network, with the native dialer ringing on each user's phone.
Same feature surface; different delivery. RingCentral, Dialpad, 8x8, Vonage Business, Nextiva — all of them ship their UCaaS feature set as softphone apps that run over Wi-Fi or mobile data. Kelir ships the same feature set as a real cellular eSIM line. The call is a PSTN-native cellular call. The call-handling features (IVR, hunt groups, departments, etc.) run as a cloud platform that controls the routing on top of the cellular line. So your team gets the depth of a UCaaS platform without the softphone failure modes — apps suspended by the OS, audio bound to bandwidth, dropped calls on bad Wi-Fi, 2FA SMS rejected as virtual.
No. The Kelir mobile app is an admin and control panel — it manages the eSIM, shows call history, lets you toggle DND or change voicemail greetings. Calls don't ring inside the app and the app doesn't need to be open for calls to come through. Inbound and outbound calls happen on the phone's native dialer (iPhone Phone, Android dialer) over the cellular voice network. The app is a configuration surface, not a voice path.
No. Voice calls run on the cellular voice network (VoLTE) through the eSIM, the same way calls on a personal cellular line work. Bad Wi-Fi, hotel networks, basements with no connectivity — none of it affects the call. Internet is only needed to use the admin portal at app.kelir.io or the Kelir mobile app, and for SMS/MMS in some carrier-rich-messaging modes.
Any phone with eSIM support: iPhone XS or newer (iPhone 14+ in the US is eSIM-only), Pixel 3 or newer, Galaxy S20 or newer, and most other phones released after 2018. Activation takes <5 minutes via direct push on iPhone or QR scan on Android. Multiple eSIM profiles run side-by-side, so your personal and Kelir lines coexist on the same phone with iOS / Android letting you set the default for outgoing calls and SMS per app or per call.
The single-user features (auto-attendant, working hours, voicemail with transcripts, recording, two-way SMS, call forwarding, do-not-disturb) are on every plan including Solo. The multi-user PBX features (hunt groups, multi-level IVR, departments, call queuing, shared voicemail, admin portal, team analytics) are on Team Starter and Pro because they require multiple seats. Team Pro adds CRM integrations, skill-based routing, audit logging, configurable retention, and priority support. See /pricing for the full feature matrix.
Yes. Number porting from any US carrier is supported. Submit the number, current carrier, and account info during onboarding; we issue a temporary number for use during the port. Most ports complete in 1–3 business days (FCC requires simple ports in one business day; complex ports take longer). No port-in fee. Port out is also free, anytime — the number is yours.
E911 is enabled on every Kelir line. Emergency calls route to the appropriate PSAP (Public Safety Answering Point) based on the address registered to the line. Per FCC requirements, the registered address must be kept current — the admin portal prompts for updates when a user moves or when a Team account opens a new office.
All data is encrypted in transit (TLS 1.3) and at rest (AES-256, AWS KMS) in AWS us-east-1. Architecture is consistent with SOC 2 Type II controls; Type II audit is on the Team Pro roadmap. HIPAA: architecture is HIPAA-aware and the AWS Business Associate Addendum covers the underlying infrastructure; a customer-facing BAA is on the Team Pro roadmap. FCC: E911 enabled, port-out free, KYC on signup, consumer disclosures published. A2P 10DLC: brand registered with The Campaign Registry, business-volume SMS deliverable. Full detail on /security.
Plan-by-plan breakdowns live on /solo and /team. The full side-by-side feature matrix lives on /pricing — every feature, marked per plan, monthly and annual cycle.