Phone Numbers | Smallest AI Docs

Atoms provides full telephony infrastructure — buy phone numbers, receive inbound calls, make outbound calls, and integrate with existing phone systems.

Capabilities

Type	Description
Inbound	Customers call your number, reach your agent
Outbound	Your agent calls customers (single or campaigns)
Transfer	Agent connects to human agents when needed
SIP	Connect to existing phone infrastructure

Getting Numbers

Buy from Atoms

Available in 40+ countries with instant provisioning.

Type	Best For
Local	Regional presence, lower cost
Toll-free	National reach, professional image
Mobile	SMS capability

Import Your Own Number (SIP)

Already have phone numbers? Import them via SIP trunking. Provide your number and SIP termination URL, and Atoms sets up both inbound and outbound trunks so your number works for making and receiving calls through the platform.

You Provide	Description
Phone Number	Your existing number in E.164 format (e.g., `+14155551234`)
SIP Termination URL	Where Atoms routes outbound calls (your SIP provider)
Username / Password	Optional, only if your trunk requires authentication

Atoms gives you a SIP Origination URL to configure in your provider so inbound calls route to your agent.

Works with any SIP-compatible provider: Twilio, Telnyx, Vonage, or your own infrastructure.

Set this up in the Platform UI or via the API.

Call Controls

During calls, agents can:

Action	Description
Transfer	Connect to human or external number
Hold	Place caller on hold with music
End	Gracefully terminate call
DTMF	Detect keypad presses
Record	Start/stop recording

SIP Integration

Connect Atoms to your existing phone system. Any provider that supports standard SIP trunking works — Twilio, Telnyx, Vonage, or your own PBX/VoIP setup.

Get Started

Platform

Buy and manage phone numbers

Developer Guide

Programmatic telephony control