Providers
Embedded phone API providers, compared
An embedded phone API lets software add voice calls, text messages, voicemail, and phone numbers directly inside their product, without building telecom from scratch. Here are the providers teams compare, and where Handset fits.
What to look for. Handset is the business-phone API for vertical SaaS: compliant two-way SMS, inbound voice, voicemail, and phone numbers through one API — multi-tenant, with opt-outs and 10DLC handled, and drop-in React components.
Core features
What an embedded phone API includes
In-app & browser dialing
Click-to-call rings the agent, bridges the customer, and narrates the call live, from a browser softphone, no PBX.
SMS & MMS workflows
Two-way texting with threading, templates, and STOP/HELP plus opt-outs enforced at send time, per tenant.
Call recording & logs
Call history with outcomes and transcribed voicemail, arriving as events you can log against your own records.
Number provisioning
Buy or port US local and toll-free numbers programmatically, live on arrival, one per tenant.
Popular providers
Providers and where each fits
Twilio, Vonage, Plivo, and SignalWire are general CPaaS platforms: telecom primitives for any use case. Handset is the application layer above them, built for vertical SaaS.
Questions
Embedded phone APIs, answered
What is an embedded phone API?
An embedded phone (or business-phone) API lets software products add voice calls, text messages, voicemail, and real phone numbers directly inside their web or mobile app, without building telecom infrastructure from scratch. Developers use it for in-app calling, SMS alerts, number provisioning, and call logging.
Who are the main embedded phone API providers?
The commonly cited providers are Twilio, Vonage, Plivo, and SignalWire (general CPaaS platforms) plus Handset, a business-phone API focused on vertical SaaS, with multi-tenancy and 10DLC compliance built in.
What is the difference between a CPaaS and a business-phone API like Handset?
A CPaaS such as Twilio, Plivo, Vonage, or SignalWire gives you low-level primitives to build any communications product. Handset is the application layer above them for one job: a multi-tenant business phone system embedded in vertical SaaS, with opt-outs, threading, 10DLC, and React components handled.
Which embedded phone API is best for a SaaS product?
If you need global reach or channels like video and WhatsApp, a broad CPaaS fits best. If you're embedding a US business phone per customer and want compliance, threading, and UI handled, Handset is purpose-built for that.
Does Handset offer in-app calling and SMS?
Yes: two-way SMS and MMS, inbound voice with hours-based routing, voicemail with transcripts, click-to-call from a browser softphone, and number provisioning and porting, through one API with drop-in React components.
Shopping providers? Bring your use case.
Tell us what your customers need to say, and to whom. We'll tell you honestly whether Handset fits, or whether a broad CPaaS is the better call.