International Long Distance Operator route

ILDO SMS Route to India

Reach Indian mobile users from outside India without DLT registration. Our ILDO (International Long Distance Operator) routes carry your OTPs and transactional SMS through licensed international gateways to Jio, Airtel, Vi and BSNL, over API or SMPP.

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  • 0DLT registrations needed
  • 4Indian networks reached
  • APIHTTP API and SMPP
What is ILDO

What is an ILDO SMS route?

An ILDO (International Long Distance Operator) is a telecom operator licensed by India's Department of Telecommunications to carry international traffic into and out of India. When an SMS starts on a server or network outside India, it enters India through an ILD gateway and is then delivered by Jio, Airtel, Vi or BSNL. That path is called the ILDO route, or the international route.

Domestic business SMS in India must follow TRAI's DLT rules: a registered business, header and template for every message. Senders based outside India often cannot complete DLT quickly, so Indian operators accept their traffic on the ILDO route instead, with an international termination charge and a numeric sender ID. Bulk SMS India offers ILDO routes for international clients, alongside our domestic DLT routes.

  • For senders abroadApps and businesses based outside India.
  • Fast startNo Indian DLT registration needed.
  • Built for OTPVerification and transactional SMS.
  • Delivery reportsStatus for every message.
Compare

ILDO route vs domestic DLT route

Both reach every Indian mobile network. The right one depends on where you are based and what you send.

ILDO routeDomestic DLT route
Who it is forBusinesses and apps based outside IndiaIndian businesses, and foreign ones on DLT
DLT registrationNot neededNeeded: entity, headers and templates
Sender IDUsually numeric, may varyYour registered brand header
Message typesOTP and transactional; promotional restrictedOTP, service, transactional and promotional
CostHigher, international termination chargesLower
Time to startDaysDepends on DLT approval

ILDO routes are for traffic that genuinely starts outside India. Businesses based in India must send on DLT routes. Rules on international traffic are set by TRAI and DoT and can change; our team confirms current requirements before you start.

Use cases

What international businesses send over ILDO

Mostly time-critical messages for Indian users.

  • Login and sign-up OTPs

    Verification codes for Indian users of global apps and websites.

  • Payment and account alerts

    Transaction and security notifications.

  • Booking updates

    Travel, ticketing and appointment confirmations.

  • Account notifications

    Password resets, device logins and account changes.

  • CPaaS and platforms

    Add Indian termination for your own customers over SMPP or API.

  • Launching in India

    Send from day one while your DLT registration is in progress.

Good practice

Getting the best delivery on ILDO routes

Indian operators screen international traffic closely.

Keep it transactionalOTPs, alerts and account messages deliver best. Promotional content is restricted.
Name your brand in the textThe sender ID is usually numeric, so start the message with your brand name.
Avoid URL shortenersShortened and unknown links are often filtered. Use your own domain if you need a link.
Send consistent contentKeep message formats stable, like an OTP template, so they are not flagged as spam.
Plan a domestic route for scaleFor large volumes or promotional SMS, register on DLT and use the domestic route at a lower cost.
Watch delivery reportsTrack delivery by operator and tell us if a pattern changes.
Get started

Start on the ILDO route in four steps

Our team sets up and tests your route with you.

  1. 1

    Share your use case

    Tell us your country, message types, sample messages and expected volume.

  2. 2

    Business verification

    Complete a simple KYC so we know who is sending.

  3. 3

    Connect

    Use our HTTP API or SMPP, or send from the web panel.

  4. 4

    Test and go live

    Send test OTPs to Jio, Airtel, Vi and BSNL numbers, check delivery reports and launch.

Frequently asked questions

What does ILDO mean in SMS?

ILDO stands for International Long Distance Operator, a telecom operator licensed in India to carry international traffic. An ILDO SMS route carries messages that start outside India through an international gateway to Indian mobile networks.

Do I need DLT registration to use an ILDO route?

No. Senders based outside India can reach Indian numbers over the ILDO route without registering on India's DLT platform. Businesses based in India must use DLT-registered domestic routes.

Can I use my brand name as the sender ID on an ILDO route?

Usually not. Messages on ILDO routes normally show a numeric sender ID, so include your brand name at the start of the message text.

Is ILDO SMS more expensive than domestic SMS?

Yes. Indian operators charge international termination rates for ILDO traffic, which are higher than domestic rates. For large volumes, registering on DLT and using the domestic route usually costs less.

Can I send promotional SMS over an ILDO route?

Promotional SMS is heavily restricted on international routes. ILDO routes are best for OTPs, alerts and other transactional messages.

Does Bulk SMS India offer ILDO routes?

Yes. Bulk SMS India offers ILDO routes for international businesses sending to Indian numbers, as well as domestic DLT routes with direct connectivity to Airtel, Vi, BSNL and Jio. Our team helps you choose the right route.

How do I connect to the ILDO route?

You can connect over our HTTP SMS API or SMPP, or send from the web panel. Delivery reports come back for every message.

Ready to send?

Tell us your countries, volumes and message types. Our team will recommend the right sender type and set up a test.

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