[Freeswitch-users] message notification

Hi, could anyone please give me a hint on how can i get a notification (or any way to find out) if a sip simple message was delivered to destination when send from a module ? (something like DLR in smpp if anything like it exists in FS so i know what happened to the message) i m currently using functions 'switch_core_chat_send' and 'switch_core_chat_deliver' to relay messages to UA's but i have not been able to find a way to find out or to get notified if a message was successfully delivered to destination or not. thank you!!