• Posted BY:
  • April 6, 2021
  • Category:

Changes in C2SMS Send API

You have to pass the DLT approved Template Id as an additional parameter, along with all other parameters as you are passing currently.

Additional Parameter

Parameter Name

How to find its value?


Numeric Value (This DLT Template Id can be found from your DLT platform)


1 (This is used for DLT Testing purposes) When you pass this additional parameter, the SMS will be delivered via DLT scenario.


Sample Encoded API URLs:

If you are using Sendhttp API, pass DLT_TE_ID parameter in your API base URL 

If you are using the V2 API, pass DLT_TE_ID parameter as below:


If you are using Old SendOTP API, pass DLT_TE_ID parameter as below:

Testing of SMS Content Template in DLT scenario:

1. Send an SMS bypassing
DLT_TE_ID and dev_mode=1 on your mobile number

2. Now, check your phone for this SMS; if you have received this SMS, that means that this Template, Header, and Template Id combination will work in the right way once the DLT Template is LIVE.

3. If you have not received this SMS, login to the C2SMS panel, go to the logs section, and search for this particular number. You will be able to see the exact reason for failure when you bring the cursor on the red failure sign.

4. Based on the failure reason, correct your mistake and try again.

a) Do not pass
dev_mode=1 on LIVE traffic, this is just for testing purposes.
b) Kindly start passing your DLT Template Id in your APIs today itself, so you don’t have to make any changes on the Go-LIVE date!





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What is bulk messaging? How does bulk SMS help your business?

Bulk SMS also referred as bulk messaging simply means sending out a large number of SMS for delivery to targeted mobile numbers. A good bulk SMS Service provider will make the process of sending out these many messages easy with the click of a button. Bulk SMS helps businesses and enterprises to send out important information to their customers. Bulk messaging is widely used for transactions, promotions and mobile marketing.

What’s the difference between transactional and promotional SMS?

Transactional SMS are those that the users have opted to receive and they are usually generated by machine/API whereas promotional SMSs are bulk messages not specific to optin users. 

What are the benefits of bulk SMS for business?

Most businesses usually look for cheap bulk messaging, free bulk SMS or cheap SMS Service provider in India. What they don’t realize is bulk messaging by default is less expensive than any other medium of transactional or promotional communication. The following are the benefits of messaging that’s how business can use bulk SMS services–

  1. Sending of personalized and customized information
  2. Brand awareness to existing users or new users
  3. You can send critical alerts to users. Stock markets and banks use SMS service widely for this purpose.
  4. This is an effective tool for internal or organizational communication
  5. It is still the fastest way to delivery any kind of information.
  6. Automation within a business is not possible without online SMS services.

How to choose the best bulk messaging partner?

A good messaging partner will care for your recipients as much as you do. The following can be the parameters to choose the best Bulk SMS Service provider–

  1. Easy API: Sending bulk SMS to lakhs of recipients must come in handy. Your bulk SMS gateway provider must give you a very easy API or admin panel that disseminates SMS via its SMS gateway in a blink.
  2. Sure-shot SMS delivery: The best bulk SMS partner will have re-routing of messages so effectively that each recipient receives the message come what may.
  3. Add-ons: A convenient bulk SMS solutions company should have easy add-ons. For instance, C2SMS various add-ons like bulk sms excel plugin, bulk sms mobile app, rewarding reseller program etc will give you endless opportunities to make your business communication easy, smooth, productive and easy on pocket.
  4. International bulk SMS service: The best bulk messaging provider will give you international bulk SMS gateway facility by default. C2SMS gives you bulk international sms service in 190+ countries across various sectors and industries.

Does C2SMS have dedicated OTP service and does it supports International SMS?

Yes,  we do have OTP sms for International with voice otp backup.

Is DLT mandatory and can I able to send SMS with DLT registration ?

Yes,  DLT registration is mandatory, and you can still able to send API sms with our default sender id for few days.