Troubleshooting guide

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Cisco Broadband Local Integrated Services Solution Troubleshooting Guide
OL-5169-01
Chapter 9 Troubleshooting Cisco Media Gateways
Call Control
Special case 3: DS1 line disappears/comes up with wrong configuration after BSC/NSC switch over/back
Check event log for DS1 and DBM related error events; issue the following DBM debug command on
SCC:
dbmdisptab (63+slot #), 0, 1
Example:
For service card in slot 2 (1-based):
MMS.9.ACTIVE-> dbmdisptab 65, 0, 1
DB(65) Table(0) : tName: DS1CFG tFileName:
C:/CONFIG/DB/c_1_Hd/DS1CFG tCbFn: DS1Callback tInitFn
tEntryInfoFn ds1LineTblEntryInfoFn tUpgradeFn c_1_Hd_DS1CFG_upgrade
tDowngradeFn c_1_Hd_DS1CFG_downgrade tVersion DB.01.00
tCbFnId: 0 tCbFnAddr: 0 tMaxEntries: 16
tCurrentEntries: 1 tTotalEntrySize: 44 tUsrSpecEntrySize:40
tNextEntry: 1 tTableStartAddr: 0 tPad: 4
tValid: 1 tCkSum: 0
HD DB(65) Table(0) :Entry (0) :00000000 00000002 00000002 00000001 00000001
00000001 00000000 00000002 00000008 0000007f 00000000value = 0 = 0x0
Special case 4: DS1 line in alarm state but call control (e.g., MPC) did not release call on DS1
• Verify trap event in lstraps output
• Capture output of MPC engineering debug command mpcDispSts
Try to reconcile trap recorded in lstraps output vs MPC’s view of traps received
Call Control
The Media Gateway Control Protocol (MGCP) defines the interaction between a Soft Switch (Call
Agent) and the Media Gateway (MGX8260). Note that all active calls are preserved across SCC, BSC,
or NSC switchover. However, transient calls are dropped.
Debugging Commands
There are several engineering debug commands that can be executed to determine various conditions/
status of calls/lines/trunks. These commands are listed in Table 9-5:
Table 9-5 Debug Commands
Command Description
ibpmuxPrtDChan Displays the status of all the active cards which have D-channels
and the status of all the D-channels on them.
ibpmuxPrtOn 4 Displays all the backhaul messages received/transmitted by
IBPMUX module on the SCC from/to the soft switch, as well as
from/to LAPDs on service cards.
ibpmuxPrtOff Turns off the display of backhaul messages received/transmitted by
IBPMUX module on the SCC from/to the soft switch, as well as
from/to LAPDs on service cards.