How Do I View the Status of an ISDN Link?
Run the display isdn call-info command.
<Huawei>display isdn call-info
Link Layer: TEI = 0, State = MULTIPLE_FRAME_ESTABLISHED
Network Layer: 0 connection(s)
If the Integrated Services Digital Network (ISDN) link is in the MULTIPLE_FRAME_ESTABLISHED state, the ISDN link is established successfully.