SMS sending failure: Error sending SMS message 0x7ffeb0001ca0 SMSTEXT，how can I tell if my message is a success or failure?

[hanyuanzhong]

A few days ago, I could send SMS messages normally. Today, I suddenly failed to send SMS messages with the following error message:

dial plan config:

The following commands are used to send short messages in python:

In addition, there is still confusion about how it found exten => sms, and how I can tell if the SMS was sent successfully or failed in python code, using the message that chatgpt returns to me as shown below, is chatgpt correct:

Again, how can I tell if my message is a success or failure? Please help me