System Architecture voip.ms │ Asterisk receives SIP MESSAGE │ [sms-in] dialplan │ ├── MessageSend SUCCESS → delivered immediately │ └── MessageSend FAILURE │ sms_queue_insert.py (AGI) │ MySQL ...

I noticed that if the SIP endpoint (UE) is not registered when the SMS arrives, Asterisk attempts the MessageSend() but the message is not delivered. To work around this, I created a small script that ...