4000 Router Series Layer 2 - WAN Configuration Guide

is not in the TEI_ASSIGNED status on a BRI, the negotiation through Q.921 frames fails, which

might because the ISDN line is not physically well connected.

• If Q.921 debugging has been enabled, and ISDN on PRI is in the multi-frame operation status and

that on BRI is in the TEI_ASSIGNED status, check whether dial-up configuration is correct. If the

system outputs maintaining information Failed to send, the physical layer has not been activated. In

this case, execute the shutdown and undo shutdown command to disable and re-enable interfaces.

• Check whether the dial-up configuration is correct. If dial-up is correctly configured and the system

does not output maintaining information Failed to send, the ISDN line might not be well connected.