The AWS SMS Gateway currently uses the Moodle site's short name as the sender ID. This can cause issues if the short name contains spaces, special characters, or doesn't match the sender ID configured in AWS, resulting in messages being sent with the default "NOTICE" sender ID.

To prevent this, the sender ID should be configurable within the gateway settings, allowing administrators to define a valid sender ID that aligns with AWS requirements.

Proposed Improvement:
Introduce a configurable setting in the AWS SMS Gateway to allow administrators to specify the desired sender ID directly from the Moodle interface.

Workaround:
As a temporary solution, I have hard-coded the sender ID in:
/sms/gateway/aws/classes/local/service/aws_sns.php

Line 65:

$senderid = "SenderName";