Is there a way without using IVR to have a voicemail box the plays a message only and does not take a message?
Try something like this:
exten => 99,1,Dial(SIP/somephone,15,r)
exten => 99,2,Answer
exten => 99,3,Playback(some_message)
exten => 99,4,Hangup
If you don’t want to try and connect the call to somephone first, don’t include the first line.
some_message.gsm should be in the asterisk sounds directory.