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Omnichannel API

Seamless Conversational messaging

Connect and engage with your customers anywhere in the world across SMS, MMS, RCS, WhatsApp, and Viber using a single, easy-to-use API.

Talk to sales
  • Personalized customer experiences
  • Global scale
  • Omnichannel conversations

Deliver a seamless omnichannel experience

Integrating your customer’s preferred channels into your website and application should be simple. Telesign’s Omnichannel Messaging API makes it quick and easy to build a comprehensive, global messaging framework.

Save time and resources

Eliminate redundant development efforts and achieve scalable growth with a single, unified API.

Reach and reliability

Reach more customers on more channels to effectively scale your business.

Build flexible, personalized workflows

Create personalized workflows by automating omnichannel conversations, marketing, alerts, and more.

Clients who use this product
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One API—Multiple channels

Achieve scalable growth by eliminating repetitive efforts and get started with a single API. Be agile and start connecting with your customers on the channels they prefer. Send and receive messages across SMS, MMS, RCS, WhatsApp, and Viber. Choose one or all five channels to efficiently broaden your programmable messaging strategy.

Score SMS message code

Smart, high-quality routing

Speed and reliability matter. Telesign’s messaging API intelligently routes your messages using the most efficient path available to provide you with the fastest and most reliable delivery possible. Be confident that your messages are delivered at the speed of business.

Omnichannel waterfall delivery for endless redundancy

Rely on best-in-class deliverability rates. Our messaging API deploys a waterfall approach with dynamic routing to ensure every message is delivered. If any message fails, it instantly redirects the communication to a new carrier route or fallsback to a different channel.

Deliver rich, personalized experiences

From first to lasting impressions, ensure every interaction is memorable. With rich media messaging options—like images, files, and CTA buttons—and smart personalization compatibilities, more authentic customer relationships are one message away.

Engagement for every interaction

Deliver fast, easy, secure and dynamic communication across the customer journey. From account creation, alerts and reminders, promotions, campaigns and customer support.

‍Get started with multiple channels and a few lines of code

Our easy-to-use messaging API and in-depth documentation makes it quick and easy to start messaging your customers.

Explore the Omnichannel docs

curl --request POST \
     --url \
     --header 'accept: application/json' \
     --header 'content-type: application/json' \
     --data '
     "channels": [
               "fallback_time": 300,
               "channel": "whatsapp"
               "channel": "sms"
     "message": {
          "default": {
               "parameters": {
                    "text": "Hello world!"
               "template": "text"
     "phone_number": "15558675309"

Engage customers on the channels they trust


Enables platforms to build communications and account security SMS messaging into web and mobile applications.


Power personalized conversations that transform the way you connect with your customers using your WhatsApp Business account.


Provide timely, personalized communication through MMS-based alerts, notifications, one-time-passcodes (OTPs), and other automated messages.


Deliver rich, personalized experiences and guarantee the delivery of important alerts, reminders, and notifications via Viber for Business.


Build enriched mobile messaging and ease friction at all stages of the customer journey through multi-media support, live chats, and secured communication.

Google Verified

Ensure the authenticity of every message you send with sender verification and branded SMS from Google. Filter out bad actors, phishing attempts and prevent fraud by communicating with confidence from the beginning.


What is Omnichannel messaging?

Having the ability to send and receive messages across different platforms, channels, and devices. This includes SMS, MMS, WhatsApp, Facebook Messenger, and more.

What are some of the benefits of Omnichannel messaging?

Provide a more seamless customer experience: Communicate with customers through their preferred channels, leading to increased customer satisfaction and loyalty.Improve Efficiency: Reduce the need to repeat the same information multiple times.Increased sales and revenue: Customers are more likely to make a purchase when messaging is available across all channels.

How is Omnichannel used to increase awareness?

By distributing the same message through multiple channels simultaneously. This can help to ensure that the message reaches as many people as possible. Creating a more unified brand experience for customers.

How does Omnichannel messaging create a positive customer experience?

Provide a consistent customer experience across channels, ensuring that customer data is shared seamlessly between channels, and managing inventory and order fulfillment across different channels.