How to send SMS to mobile number for authentication that too by making use of Portals

The best way to achieve this is to use a SMS verification service and connect to its APIs from your portal. Basically, once you have the user's phone number you would invoke the verification service that will send a code via SMS. You would need to capture the code from the user through an input field and call the service again to verify the code.

Hello Shaik Gousi

Currently there is no built in feature from Appian as far as I know. May be you can try using some API's or a Connected system/Plug-in from the app market.

Here is a connected system from the Appian App market.

https://community.appian.com/b/appmarket/posts/nexmo-connected-system

Hopefully it works for your requirement.

May be you can wait for the experts to provide a better approach.

Thanks for the response

Ok Thanks for sharing Chaitanya....

Shaik Gousi Is this compatible with portals???

Yes Kapil,

We are publishing a portal for the users outside of the Appian environment people to interact with the application and to fill the application form. Meanwhile in the flow there is a requirement where we need to authorize them sending an OTP to their mobile number which we will be collected from the contact information of that particular user. 

It's completely having to done within the portal UI's.

One common way to achieve the scenario you described is to use an SMS API to send the OTP to the user's mobile number and verify it on the backend before allowing the user to submit the form. Here's a high-level overview of the process:

1. The user fills out the form and provides their mobile number
2. The backend generates an OTP and sends it to the user via the SMS API
3. The user inputs the OTP they received on their phone into the form
4. The backend verifies the OTP and if it's correct, allows the form to be submitted.

There are many SMS APIs available that you can use to implement this, including Twilio, Nexmo, and many others. You can choose one that fits your requirements and budget.

Source: Bulk SMS Service Provider

Thank you so much

Shaik Gousi