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
Data Path Troubleshooting
Data path debugging and troubleshooting is required when any of the following cases occur:
• No Voice
• BERT Test Fails
• Tone Detection Fails
There Is No Voice
Fault Isolation
1. Make sure that T1/E1 lines and channel bank are configured correctly.
2. End point on NSC: determine the type of call:
dspvoiceparm <slot>, <port> (on NSC, display voice params)
3. Port State=CHANNEL_CONNECTED
-- connType=T1_VOIP, Primary Entry=1
-- chanIdx 0 dse 0, dsp 0, chan 0
-- Channel State=CHAN_ONLINE
rtpPort 402 ecn 500 oldParm 0
encType=GrpG711 silenceTmr 20 CNG 0 pktLoading a
echoCan 4 dtmf 0 mf 0 fax 0 rxGain 0 txGain 0
The results show that the call is a VoIP call (connType=T1_VOIP), codec is G.711, VAD/CNG is off
(CNG 0) and echoCan is On (echoCan 4). The DSP resource used is: dseNum=0 (dse 0) dspNum=0 (dsp
0) chanNum=0 (chan 0).
Solution
Step 1 If it is a VoIP call, make sure that the DSP is alive
lsdsps (on SCC, list DSP status)
Step 2 Find out whether packets drop
dspvoicestat <slot>, <port> (on NSC, display voice status)
pduIn = 7687
pduDone = 7695
ingrPacketCnt = 7687
ingrPacketDrpCnt = 32
…
egrPacketCnt = 7695
egrPacketDrpCnt = 1