The alter isdn q931 Command
Use the alter isdn q931 command to watch the Q931 signaling letters go aback and
forth while the router negotiates the ISDN connection.
Although the alter isdn accident and the alter isdn q931 commands accommodate similar
debug information, the advice is displayed in a altered format. If you appetite to see
the advice in both formats, accredit both commands at the aforementioned time. The displays
will be intermingled:
■ The ISDN contest that can be displayed are Q.931 contest (call bureaucracy and teardown of
ISDN arrangement connections).
■ Use the appearance dialer command to retrieve advice about the cachet and configuration
of the ISDN interface on a router.
Example 4-23 shows an ISDN Q.931 alter in an E1 Euro PRI environment.
Example 4-23 ISDN Q.931 Debugging in an E1 Euro PRI Environment
Chapter 4: Performing Alarm Signaling over Digital Voice Ports 241
Router#show debugging
The afterward ISDN debugs are enabled on all DSLs:
debug isdn absurdity is ON.
debug isdn accident is ON.
debug isdn q931 is ON. (filter is OFF)
[... achievement bare ...]
*Mar 4 13:25:20.698: ISDN Se0/2:15 Q931: RX <- ALERTING pd = 8 callref = 0x8004
Progress Ind i = 0x8088 - In-band advice or adapted now available
*Mar 4 13:25:22.336: ISDN Se0/2:15 Q931: RX <- CONNECT pd = 8 callref = 0x8004
*Mar 4 13:25:22.344: ISDN Se0/2:15 Q931: TX -> CONNECT_ACK pd = 8
callref = 0x0004*Mar 4 13:25:24.408: ISDN Se0/2:15 Q931: RX
<- DISCONNECT pd = 8 callref = 0x8004
Cause i = 0x8090 - Normal alarm clearing
*Mar 4 13:25:24.436: ISDN Se0/2:15 Q931: TX -> RELEASE pd = 8 callref = 0x0004
*Mar 4 13:25:24.468: ISDN Se0/2:15 Q931: RX <- RELEASE_COMP pd = 8
callref = 0x8004
Example 4-24 shows an ISDN Q.931 alter in an E1 QSIG environment. In adverse to
the E1 Euro PRI, the QSIG affiliated cardinal is presented in the output.