[asterisk-users] AOC-D or similar

[Ale]

hi all,

I'm trying to send text messages to Snom 300 to show the credit 
remaining during the call...

Sending a MESSAGE  directly to the phone via udp i'm able to update the 
text on the display... but not during the conversation.

I read about AOC, but i can't find any documentation about Asterisk + 
SIP + AOC

Have you any experience, docs or workaround to suggest?

Thx  Ale