How to Configure Time-to-Live (TTL) for SMS Messages Sent via SNS Publish API?

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I am using the Amazon SNS publish API to send SMS messages and need to configure a Time-to-Live (TTL) for these messages. I would like to confirm the following:

1/ How can I set Time-to-Live (TTL) for SMS messages at the API/SDK level when using the publish method to send mobile SMS? Is there a way to specify TTL for individual messages directly in the API call or SDK method?

2/ How can I configure Time-to-Live (TTL) settings globally for SMS messages in Amazon SNS? What are the steps or commands to set a default TTL for all SMS messages sent from my account?

3/ Are there any alternative methods or settings for managing TTL for SMS messages beyond the global configuration? If TTL cannot be set directly through publish or globally, are there other ways to handle message expiration or retention for SMS?

I appreciate any guidance or examples on how to manage TTL settings for SMS in Amazon SNS.

Thank you!

  • To configure Time-to-Live (TTL) for SMS messages sent via the Amazon SNS Publish API, you can follow these steps:

    Specify the TTL value in the message attributes when publishing the SMS message:

    1. You can set the TTL value using the MessageAttributes parameter in the Publish API call. The TTL attribute is specific to each push notification service, such as AWS_SNS_SMS_TTL for SMS messages.
    2. The TTL value must be a positive integer representing the number of seconds the message should be kept before expiring. Example using the AWS CLI: aws sns publish
      --phone-number "+12345678901"
      --message "This is a test SMS message"
      --message-attributes '{"AWS_SNS_SMS_TTL":{"DataType":"Number","StringValue":"600"}}'

    Here are some article for the reference. https://docs.aws.amazon.com/sns/latest/dg/example_sns_PublishTextSMS_section.html https://docs.aws.amazon.com/sns/latest/dg/sns-ttl.html

1 Answer
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Hello @jona

Amazon SNS doesn't directly support setting a Time-to-Live (TTL) for SMS messages. TTL is a feature for message queues, not for immediate delivery services like SMS via SNS. SMS messages are typically delivered immediately or fail quickly.

To configure Time-to-Live (TTL) for SMS messages sent via the Amazon Simple Notification Service (SNS) Publish API, follow these steps:

Step 1: Understand TTL in SNS TTL (Time-to-Live) is a parameter that defines how long a message should be retained if it cannot be delivered immediately. For SMS messages, this is particularly useful to ensure messages are not delivered after a certain period if the recipient is unavailable.

Step 2: Access the AWS Management Console Log in to your AWS Management Console. Navigate to the SNS service.

Step 3: Create or Select an SNS Topic If you haven't already, create an SNS topic that will be used to send SMS messages. Alternatively, select an existing topic.

Step 4: Configure Message Attributes for TTL When publishing a message to the SNS topic, you can specify message attributes. Use the AWS.SNS SDK or AWS CLI to set the AWS.SNS.SMS.MaxPrice attribute, which indirectly influences TTL by controlling cost and delivery speed.

Step 5: Publish a Message with TTL Use the AWS SDK for your preferred programming language or AWS CLI to publish a message. Include the MessageAttributes parameter to set TTL. Note that SNS does not directly support TTL for SMS, but you can manage retries and delivery settings through attributes. Example using AWS CLI:

aws sns publish \ --phone-number "+1234567890" \ --message "Your message here" \ --message-attributes '{"AWS.SNS.SMS.MaxPrice":{"DataType":"String","StringValue":"0.50"}}'

Step 6: Monitor Message Delivery Use CloudWatch metrics to monitor the delivery status of your SMS messages. Adjust your TTL strategy based on delivery success and failure rates.

Final Answer AWS SNS does not directly support TTL for SMS messages, but you can manage delivery settings through message attributes like MaxPrice. Use the AWS SDK or CLI to set these attributes when publishing messages. Monitor delivery with CloudWatch to optimize your SMS strategy.

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