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140 Chapter 6: Using ISDN and DDR Technologies
Example 6-2 shows the beginning of a call setup. The output is from a ping to the remote side
while the debug isdn q931 command is active. Note the ping timeout (.), which is followed by
a ping success (!) after the call setup.
The ICMP traffic falls within the parameters of what has been defined as interesting traffic. The
call is placed and interface BRI 0, B channel 1 can be seen initializing and completing the call.
The last line of the output states that the call is connected to 2145553000, RouterB.
Once the call is up, you can monitor the call using the show isdn status command. This is a
useful troubleshooting command because it shows the status of all three layers of ISDN that
have been discussed in this chapter.
Example 6-3 shows the output from the show isdn status command. Note that both B channels
are connected to the remote side. This is visible under the Layer 2 Status section.
Example 6-2
debug isdn q931 Command Output Reveals Call Setup Details
RouterA#debug isdn q931
RouterA#ping 10.12.1.2
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 10.12.1.2, timeout is 2 seconds:
ISDN BR0: TX -> SETUP pd = 8 callref = 0x0E
Bearer Capability i = 0x8890
Channel ID i = 0x83
Keypad Facility i = 0x3935353532303032
ISDN BR0: RX <- SETUP_ACK pd = 8 callref = 0x8E
Channel ID i = 0x89
ISDN BR0: RX <- CALL_PROC pd = 8 callref = 0x8E
ISDN BR0: RX <- CONNECT pd = 8 callref = 0x8E
%LINK-3-UPDOWN:Interface BRI0:1, changed state to up
ISDN BR0: TX -> CONNECT_ACK pd = 8 callref = 0x0E
%LINEPROTO-5-UPDOWN: Line protocol on Interface BRI0:1, changed state to up.!!!
Success rate is 60 percent (3/5), round-trip min/avg/max = 36/36/36 ms
%ISDN-6-CONNECT: Interface BRI0:1 is now connected to 2145553000 RouterB
Example 6-3
show isdn status Command Output
RouterA#show isdn status
The current ISDN Switchtype = basic-5ess
ISDN BRI0 interface
Layer 1 Status:
ACTIVE
Layer 2 Status:
TEI = 90, State = MULTIPLE_FRAME_ESTABLISHED
Layer 3 Status:
1 Active Layer 2 Call(s)
Activated dsl 0 CCBs are 2, Allocated = 2
callid=0, sapi=0, ces=2
callid=8000, sapi=0, ces=1