[Asterisk-Users] About CallBack function

[Comer]

Hello ,
Do anyone know how  Asterisk  support CallBack function ?
Are there some documents about CallBack of Asterisk?
Thanks!
 				

　　　　　　　　Comer
　　　　　　　　hbyang at ustc.edu
　　　　　　　　　　2004-12-25