加拿大地区使用AWS SNS固定发送号码发送短信的技术咨询

Hey there! Let's work through this problem you're having with AWS SNS sending SMS from random numbers in Canada. As you noted, Canada doesn't support Sender ID, which is why you're seeing random sender numbers by default—but there are two solid workarounds to lock in a consistent sending number:

1. Request an AWS SNS Short Code #

Short codes are dedicated, fixed 5-6 digit numbers built for high-volume SMS messaging, and they're fully supported in Canada. Here's how to get one:

• Head to the AWS SNS Console, navigate to SMS messaging > Short codes
• Click Request short code, select Canada as your target country
• Fill out the application details (be clear about your use case: test messages, event alerts, etc., plus your expected send volume)
• Wait for AWS to review and approve your request (this usually takes 2-5 business days)
• Once approved, configure your SNS messages to use this short code as the sender. For example, in API calls, you can specify it via message attributes, or associate it directly with your SNS topics.

Here's a quick AWS CLI example to send a message with your short code:

aws sns publish \
  --phone-number "+1XXXYYYZZZZ" \
  --message "Your test alert message" \
  --message-attributes '{"AWS.SNS.SMS.SenderID": {"DataType": "String", "StringValue": "YOUR_SHORT_CODE"}}'

2. Request a Dedicated Long Code (10-Digit Phone Number) #

If you don't need high-volume capabilities, a dedicated long code works perfectly for consistent sending. Here's the process:

• Go to AWS SNS Console > SMS messaging > Phone numbers
• Click Request phone number, select Canada as the country, and pick either transactional or promotional use case (match this to your message type)
• Once approved, this number is yours to use exclusively. When publishing messages, specify this number as the sender to ensure every SMS comes from the same source.

Key Notes #

• Both short codes and long codes require AWS approval—be specific about your intended use in the application to speed up review
• After getting your number, send a test message right away to confirm it's working as expected
• Short codes typically have higher sending limits than long codes, making them a better fit if you're sending large volumes of alert messages

内容的提问来源于stack exchange，提问作者dguay