MessageSend delivery not guaranteed, advices?

I am using MessageSend to send notifications to SIP phones, resembling SMS. The documentation states quite clearly that if I get a “SUCCESS”, it doesn’t mean the phone has received the message.

SUCCESS: Successfully passed on to the protocol handler, but delivery has
not necessarily been guaranteed.

Do you have any advice on how to check if the phone has really received the message?

No because the only way to know is the get the reply back that it was received. Since Asterisk doesn’t allow you to read the SIP replies, you have no way to get that information.

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