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How to enable PCM Capture on ISR Voice GW


=> Steps below are taking an example for PRI. One 1 B channel can be captured at a time.

=> As we do not know which B channel the call will come in on, we need check the right B-channel in real time.

=> For issues relating to call setup, you could try busying out channels, OR using Triggered PCM capture (not discussed here).

=> Same steps can we be used for FXO/FXS ports too, only change the port numbering scheme.

*** PCM capture instructions:

conf t
voice hpi capture destination flash:pcm.dat
voice hpi capture buffer 5000000

>> At this point you need to figure out exactly which voice port  you are on:

show call active voice brief


>> Once you have the port information then you issue the following command:

# test voice port 0/0/0:15.1 pcm-dump caplog 7      ----> assuming you are on PRI 0/0/0:15 and the 1st B-channel

>> Once you are done capturing the issue, do this to stop the capture

# test voice port 0/0/0:15.1 pcm-dump disable
conf t
no voice hpi capture destination flash:pcm.dat
no voice hpi capture buffer 5000000

>> Now do a dir flash: and you will see a file "pcm.dat" that's the file. You will need to send this file to TAC, so it can be analyzed.

>> Remember if you need to redo the call, always delete the pcm.dat file, and start again. Just so that we do not have calls multiple call info in a single PCM file.


through whihc application can i open pcm.dat file.???????

Amit Sharma
Cisco Employee

Please mail to .dat file to TAC for further analysis.

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