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
• lsevt 0 <NSC slot>
When the end point is on BSC:
Step 1 Find out the DSP channel on which NSC is assigned to provide the service for this connection:
dspDspRscAll <NSC Slot> (on SCC)
dspDspRscAll 0
DspChan 0: SRC SLOT 12 PORT 0 --> VIA SLOT 0 ECN (257, 11) --> DST ...
DspChan 1: SRC SLOT 12 PORT 1 --> VIA SLOT 0 ECN (769, 11) --> DST ...
The result shows that the DSP channel number 0 on the NSC slot 0 is used to service port 0 on the BSC
slot 12 via ECN number 257. In order to use the dspvoiceparm(stat) commands, record the ECN number
for the BSC port.
Step 2 Use dspDspRscAll commands for all NSCs on the chassis until the specific BSC port is found. If the
BSC port is not found, there is no DSP service required for the call. It will be a TDM call without echo
cancellation.
The dspvoiceparm on BSC lists the parameters of the call on that port.
No dspvoicestat on BSC card.
dspvoiceparm <BSC slot> <port > (on BSC, display voice parm)
Port State CHAN_BSC_CONNECTED, primaryDs0 1
Step 3 If DSP service is required for the call, you must go to the NSC card to debug. Use dspvoiceparm and
dspvoicestat the same way as the end point on NSC except that use ‘16’ as the <slot> number and ECN
number as the <port>.
dspvoiceparm 16, 257 (on NSC, display voice parms)
dspvoicestat 16, 257 (on NSC, display voice status)
If the connType from dspvoiceparm (on NSC) is VIA_VOIP, it is a VoIP call. Follow the procedure for
T1_VOIP connections to debug.
If the End point is on BSC (TDM):
Step 1 If the connType from dspvoiceparm is not VIA_VOIP (e.g VIA_EC_VIA, etc), it is a TDM call. Since
no DSE and C6 DSP are involved in TDM calls, the problem is likely on the devices along the data path
(cell drops?, etc). See the debugging guides for those devices for details. However, provide the following
information when reporting the problem:
• dspvoiceparm <BSC slot> <port>
• dspvoiceparm <NSC slot> <port>
• dspDspRscAll <NSC slot>
• lsevt 0 <BSC slot>
• lsevt 0 <NSC slot>