ISDN 功能
c
calling party recognition service(direct-in termination(dit)) [主叫方识别服务(直入终端(dit))]
d
did addressing(did 寻址)
did and dod addressing(did 和dod 寻址)
e
event based ccis(基于ccis 的事件)
i
isdn terminal(isdn 终端)
s
sid to network-present(sid 到网络–提供)
sid to termination user-display(sid 到终端用户–显示)
sub address-present(子地址–提供)