What Does PTT Error Code 23 (Absent Subscriber) Mean?
You might see the PTT Error Code 23 (Absent Subscriber) in one of your delivery reports. This means that the number you are sending to no longer exists – so it could be wrong, fake, or old and now out of service.
The PTT Error Code is a permanent code, meaning that sending a message to the same number again in the future will result in the same outcome again. So it’s best practice to remove these numbers from your database to ensure you have a correct and up-to-date list of numbers.