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Sunday, March 2, 2014

What are the steps to enable PCM Capture on ISR Voice GW?

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
(Please click here for more details) 
  • 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.

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