[Asterisk-Users] sendtext to a phone that is off

[Jerry Geis]

I am doing a sendtext() message to a phone.
It works just fine. However I am looking at the case where the phone is
off or not available...

In that off case voicemail picks up for the phone so the call is still
answered and sendtext() is still called.

How do I tell if I am getting voicemail so I continue to try
and send the text message until it is delivered... vs.. a false
sendtext() message that really wasnt delivered at all because
voicemail answered the call..

THanks,

Jerry