---
title: How do I whitelist URLs, app links and callback numbers on my DLT portal?
description: "You whitelist CTAs on the DLT portal where your business is registered as a Principal Entity (PE): Jio, Airtel, Vi (VilPower), BSNL, Tata or SmartPing. Menu names differ between portals, but the process is the same. ## Steps 1. Log…"
url: "https://www.smsgatewaycenter.com/blog/kb/how-do-i-whitelist-urls-app-links-and-callback-numbers-on-my-dlt-portal/"
updated: "2026-09-18"
category: Bulk SMS / DLT / CTA Whitelisting
---

# How do I whitelist URLs, app links and callback numbers on my DLT portal?

You whitelist CTAs on the DLT portal where your business is registered as a Principal Entity (PE): Jio, Airtel, Vi (VilPower), BSNL, Tata or SmartPing. Menu names differ between portals, but the process is the same.

## Steps

1. Log in to your DLT portal with your Principal Entity account.
2. Open the section for CTAs, URL/callback whitelisting or "Call to Action".
3. Add each item under its correct type:
   - **URL**: static URLs, dynamic URLs or short URLs.
   - **OTT / APK**: app download links and links that open apps, such as WhatsApp links.
   - **Number**: mobile, landline or toll-free callback numbers.
4. Submit, and wait until the portal shows the entry as approved or active.
5. Link the CTA to the content templates that use it, where your portal asks for this.

## Things that often go wrong

- **Short links:** if you use a link shortener, including Smart Links, whitelist the **short link's domain**, not only your website's domain.
- **A new domain or subdomain** (for example, a campaign landing page on a new subdomain) needs its own entry.
- **Changing your support number** means whitelisting the new number before you send messages with it.
- **Several portals:** if you're registered on more than one DLT portal, whitelist on each portal you send through.

## After whitelisting

Send a test message to your own number. If it still fails with **CTA Mismatch**, see *How do I fix a "CTA Mismatch" failure?*

Only whitelist links and numbers you control. When you whitelist, you confirm to the operators that they are not malicious.

**Official source:** [TRAI press release on URL/APK/OTT whitelisting (PIB)](https://www.pib.gov.in/PressReleaseIframePage.aspx?PRID=2058943); [TCCCPR (Second Amendment) Regulations, 12 Feb 2025](https://www.trai.gov.in/sites/default/files/2025-02/Regulation_12022025.pdf).

### More Related Articles

- [How do I fix a “CTA Mismatch” failure?](https://www.smsgatewaycenter.com/blog/kb/how-do-i-fix-a-cta-mismatch-failure/)
- [What is CTA whitelisting, and why was my SMS blocked?](https://www.smsgatewaycenter.com/blog/kb/what-is-cta-whitelisting-and-why-was-my-sms-blocked/)

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