Troubleshooting guide

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Cisco Broadband Local Integrated Services Solution Troubleshooting Guide
OL-5169-01
Chapter 9 Troubleshooting Cisco Media Gateways
Data Path Troubleshooting
Fax/Modem Fails
Before starting your Fax/Modem, make sure that the connection is setup correctly (if possible, test the
connection by talking on the phone).
If connected to channel bank, make sure that the channel bank is configured properly with the DS1 lines
(robbitedBit, source of the clock).
If any switchover occurs while Fax/Modem is in progress, the Fax/Modem calls will be dropped. This is
an expected result.
Provide the following information if your Fax/Modem fails:
• Take TCG trace on NSC
• Take DSE trace on NSC
• Enter the command dspvoiceparm (before fax/modem starts and afterwards)
• Enter the command dspvoicestat (a few times before and after fax/modem starts)
• Enter the command c6Dump
COT/Testline Fails
If SCC switchover occurs, the tests will be terminated. This is an expected result.
If the switchover fails, it is likely that either the parameters are not sent down correctly from the call
control or the DSP does not work correctly.
Provide the following information when reporting the problem:
• Take TCG trace on NSC
• Take DSE trace on NSC
Tone Detection/Play Fails
The tone detection/play is enabled when the call is VoIP and the codec is G.726 or G.729. Otherwise,
the tones are sent/received just like voice. Use the c6Dumpcommand to see whether the feature is
enabled:
c6Dump <dse> <dsp>
chan codec vad/cng dtmf mf ….
0 G.726 0 1 0
If ‘dtmf’ is set 1, the tone detection/play is enabled. (The dseNum, dspNum, chanNum can be retrieved
from dspvoiceparm).
If detection/play is NOT enabled, the tones are treated like voice. This problem is not specific to the
tones.
If it is enabled, the problems can be that the DSP does not detect the tone correctly or the DSE does not
send/receive the NTE packets correctly. Provide the following information when reporting problems:
• Take DSE trace on NSC
• dspvoiceparm
• dspvoicestat
• c6Dump