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Troubleshooting Voice over ATM SVCs
Troubleshooting Voice over ATM SVCs
When problems occur with voice over ATM SVCs, follow the steps below to look first for simpler
problems before progressing to more complex possible issues. For general information about
troubleshooting and voice QoS, see Cisco IOS Release 12.0 Voice, Video, and Home Applications
Configuration Guide. Please see if any additional steps should be mentioned here.
Step 1
Step 2
Step 3
Step 4
16
Cisco IOS Release 12.0(7)T
Make sure that the ATM interface, serial ports, and controllers are set to no shutdown.
On both Cisco MC3810 multiservice access concentrators, make sure that ILMI and
Q.SAAL PVCs are set up in order to allow SVC communications. The privileged EXEC
show atm pvc command displays information about configured PVCs, including the
ILMI and Q.SAAL PVCs.
Router# show atm pvc
VCD /
Interface
Name
0
1
0
2
Ensure that NSAP addresses are set up and confirmed as operational under the ATM
interfaces of the Cisco MC3810 multiservice access concentrators on both sides of the
communication. Enter the privileged EXEC show atm video-voice address or show atm
ilmi-status command, which are illustrated below. show atm ilmi-status provides more
details about the ILMI PVC than does show atm video-voice address:
router# show atm video-voice address
nsap address
47.0091810000000002F26D4901.00107B4832E1.FE
router# show atm ilmi-status
Interface : ATM0 Interface Type : Private UNI (User-side)
ILMI VCC : (0, 16) ILMI Keepalive : Enabled (5 Sec 4 Retries)
ILMI State:
UpAndNormal
Peer IP Addr:
10.1.1.11
Peer MaxVPIbits:
8
Active Prefix(s) :
47.0091.8100.0000.0002.f26d.4901
End-System Registered Address(s) :
47.0091.8100.0000.0002.f26d.4901.0000.1111.5555.05(Confirmed)
47.0091.8100.0000.0002.f26d.4901.0010.7b48.32e1.fe(Confirmed)
47.0091.8100.0000.0002.f26d.4901.0010.7b48.32e1.c8(Confirmed)
Check the voice ports for busyout status by issuing the show voice busyout command. If
the busyout-monitor interface or busyout forced command has been issued, one or
more voice ports may be busied out, either due to a serial interface failure or because the
voice port has been forced into a busyout state.
router# show voice busyout
If following network interfaces are down, voice port will be put into busyout
state Serial0
The following voice ports are in busyout state 1/10
Enter show interfaces serial to check the specified serial interface, or enter show voice
port to check the voice-port status. The no form of the busyout forced command restores
the voice port.
Peak
VPI
VCI
Type
Encaps
0
5
PVC
SAAL
0
16
PVC
ILMI
Peer IF Name:
Peer MaxVCIbits:
Avg/Min Burst
SC
Kbps
Kbps
UBR
56
UBR
56
type
ilmi status
VOICE_AAL5
Confirmed
ATM1/0/0
14
Cells
Sts
UP
UP
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