[Freeswitch-users] SIP SIMPLE with mod_sms

I would like to implement SIP SIMPLE into my FS configuration. For use with Bria client. I've looked into mod_sms and it seems to be the way go. If so, are there a standard example for a dial plan for sending messages between clients? And instead "voicemail" for calls are there a queue functions build in, for if clients are offline?