How to schedule SMS using SCG Messaging API


The SCG messaging API supports scheduled delivery of SMS messages at a specific moment in time. This enables the user to create & send SMS ahead of the intended delivery time.


This document describes how to use the SCG message_requests API method, specifically the field "scheduled_delivery_time" option in the request body to set the delivery time for a SMS message. It describes the field type: epoch time. For more information on epoch time follow the link


Requesting a scheduled SMS

Through the SCG Messaging API: The field "scheduled_delivery_time" requires the value for the required time to deliver the SMS to be in epoch format.  As shown in this example:

  • The epoch time is the number of seconds that have elapsed since January 1, 1970 (midnight UTC/GMT).
  • Epoch time can be a timestamp in seconds (10-digit), milliseconds (13-digit) and microseconds (16-digit).
  • the date command to convert from human date to epoch is :

$ date +%s -d"Jun 29, 2022 17:40:00"



Here is an example Curl command to send a scheduled SMS at Jun 29, 2022 05:40:00 PM:

curl -L -X POST \
-H "Content-Type: application/json" \
-H "Authorization: Bearer [TOKEN]" \
-d "{\"from\":\"channel:Bxn9SHBYhl89KnuDllO2L4\",\
\"body\":\"Test scheduled message using curl command 10 digit\"}"


You can see in the DR the message request’s “state” change from “SCHEDULED” to “SENT” in the scheduled time.

  "topic": "SCG-Message",
  "attempt": 1,
  "event": {
    "fld-val-list": {
      "previous_state": "SCHEDULED",
      "message_request_id": "A7gE4xn5JD17a1MvdnEwT2",
      "message_id": "A7gE4xn5JD17a1MvdnEwT2",
      "to_address": "+5066173XXXX",
      "has_attachment": false,
      "reason_description": "SUCCESS",
      "application_id": 11407,
      "reason_code": "200",
      "sender_id_alias": "FVwXNFWghnXyBazsR1HxQ3",
      "company-id": [company_id],
      "sender_id_id": "FVwXNFWghnXyBazsR1HxQ3",
      "external_message_request_id": "",
      "new_state": "SENT",
      "fragments_count": 1,
      "from_address": "7777",
      "mt_price": 0.024
    "evt-tp": "message_state_change",
    "timestamp": "2022-06-29T23:40:00.323Z"
  "event-id": "uyrjt86vRnq2TR08c4xAwA"



Epoch timestamp: 1656567600 = June 29, 2022 5:40:00 PM GMT-06:00 = 2022-06-29T23:40:00.323Z


Scheduled messages can also be sent via the “Send message” option in the SCG Voice & Messaging console:  Check the Scheduled message check box as shown here to enable the date and time for delivery:




In the OUTBOX you can find the request details:





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