3Com 3031 Command Reference Manual page 265

Description
Using the debugging isdn command, you can enable ISDN debugging. Using the
undo debugging isdn command, you can disable ISDN debugging.
You must enable terminal debugging first before ISDN debugging can take effect.
Example
Enable CC debugging.
<3Com> debugging isdn cc
Disable CC debugging.
<3Com> undo debugging isdn cc
display isdn Syntax
active-channel
display isdn active-channel [ interface type number ]
View
Any view
Parameter
interface type number: Interface type and number.
Description
Using the display isdn active-channel command, you can view the active call
information on ISDN interfaces. If no interface has been specified, the system will
display the active call information on all the ISDN interfaces.
The displayed information can help you with ISDN call troubleshooting.
Example
Display the active call information on the interface bri 0/0/0.
[3Com] display isdn active-channel interface bri 0/0/0
Bri0/0/0 :
-------------------------------------------------------------
Channel
Info
B1
q931: Enables ISDN Q.931 module debugging.
spid: Enables SPID debugging for the BRI interfaces running the NI
protocol.
interface type number: Interface type and number. You can enable
ISDN signaling debugging on an interface by specifying its type and
number. If no interface has been specified, the system will enable
ISDN signaling debugging on all the ISDN interfaces.
Call Call Calling
Property Type Number
Digital Out 8810124
ISDN Configuration Commands
Calling Called
Subaddress Number
265
Called
Subaddress