问题：

[多选] Which of the following are correct regarding ISDN?（）

A . Legacy DDR can use port information to define interesting traffic.
B . Legacy DDR can configure multiple dialer configurations on the same interface.
C . Legacy DDR can use ACLs to define interesting traffic.
D . HDLC or PPP can be used to encapsulate ISDN D channel information.
E . The BRI interfaces on ISDN routers with dialer profiles configured cannot belong to multiple dialer pools.
F . Dialer profiles cannot use extended ACLs to define interesting traffic.