SMS and RCS

SMS and RCS API
for AI agents

The Vobiz SMS and RCS API enables two-way messaging from the same numbers that your AI voice agent calls from. Capabilities include interactive media, delivery receipts and button taps, so your AI agent can manage the entire conversation.

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SMS & RCS docs

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SMS, MMS and RCS on one endpoint

Automatic RCS-to-SMS fallback

10DLC registration by API

Read receipts on RCS

How it works

From API key to a two-way conversation
in four steps

1.
Get a messaging-enabled number
Search and buy a US local or toll-free number by API.
2.
Register for US delivery
Create your 10DLC brand and campaign by API, then attach your number. Carriers review it before A2P traffic flows.
3.
Send a message
One request, with channel set to sms, mms or rcs.
4.
Manage inbound
Point a webhook at your agent. Inbound messages, delivery receipts and RCS button taps arrive as events.

cURL

# Send an RCS message with buttons that falls back to SMS
curl -X POST https://api.vobiz.ai/api/v1/sms/messages \
  -H "X-Auth-ID: $AUTH_ID" -H "X-Auth-Token: $AUTH_TOKEN" \
  -H "Content-Type: application/json" \
  -d '{"from":"+14155550100","to":["+14155550123"],"channel":"rcs",
       "text":"Your appointment is confirmed for 3pm tomorrow.",
       "rcsSuggestions":[
         {"type":"REPLY","text":"Reschedule","postbackData":"reschedule"},
         {"type":"DIAL_PHONE","text":"Call us","postbackData":"call","phoneNumber":"+14155550100"}],
       "failoverToSms":true,"idempotencyKey":"appt-8812-confirm"}'

Messaging quickstart →

Three channels, one endpoint

SMS, MMS and RCS through one API

Set the channel on each message. Webhooks, status tracking, opt-outs and idempotency work the same across all three.

	SMS	MMS	RCS
Content	Text	Text up to 5,000 characters, plus media	Text, files, location
Media	None	Up to 10 HTTPS URLs: JPEG, PNG, GIF, MP4, 3GP, VCF, PDF	Files by URL
Interactive	None	None	Buttons: reply, open link, call, show or request location
Status	Sent, delivered, failed	Sent, delivered, failed	Delivered, seen, button tapped
Billed as	Per segment	One message, whatever its length	One message, no segments
Reaches	Any mobile number	US and Canadian numbers	RCS-capable handsets, checked before send

Send an SMS with media to a US or Canadian number and it goes as MMS automatically. No code change.

RCS

RCS business messaging, with SMS fallback built in

RCS puts your verified brand name and logo on the message, adds buttons, and tells you when it was read. Not every handset can receive it, so Vobiz checks first and falls back to SMS when it can’t.

RCS reference

Check reachability per number

— find out whether a recipient can receive RCS before you send.

capability check

Fall back to SMS automatically

— set one flag and an unreachable recipient gets the message as SMS.

failoverToSms

Buttons that do something

— quick replies, open a link, call a number, show or request a location.

REPLY · OPEN_URL · DIAL_PHONE · SHOW_LOCATION · REQUEST_LOCATION

Know when it was read

— a message.seen event when the recipient opens the message.

Know what they tapped

— a message.button_tap event carrying the postbackData you set on the button.

Send a verified brand

— register your RCS sender by API and track its approval status.

sender status

Voice and text together

The text channel for your voice agent

Most calls end with something the caller needs in writing: a confirmation, a link, an address. Send it from the same Vobiz account, while the call is live or the moment it ends.

Voice API