By which parameters is SMS duplication determined? Is duplication the reason for not sending SMS?

SMS duplication is usually determined by the following parameters:

• Recipient's number
• Message text
• Time interval between sends (for example, if the same message is sent multiple times in a short period)

If the system detects that a message with the same parameters has been sent recently, it may consider the new message a duplicate.

Duplication can be a reason for not sending an SMS if the system has logic to prevent resending identical messages to avoid spam or excessive load. In such cases, duplicates are blocked or ignored.