Capturing audio to troubleshoot line quality issues
Objective:
To set up a rule in the routing table of a Dialogic® 2000 Media Gateway Series (DMG2000) gateway to specify an outbound TDM channel for capturing the audio, mainly to troubleshoot problems where a line quality issue is suspected.
Reason:
Since the audio capture can only be done on one channel, it is easier to set up a specific channel rather than wait for the right channel to be used or for the load on the DMG2000 gateway to be so low that the outbound channel would be the lowest one (Channel 1).
Procedure:
To specify the channel, open the DMG2000 gateway configuration interface and go to Configuration > Routing table.
Click on the 'TDM Trunk Groups' radio button and create a new group as shown in this example:
Please click on the image to display it full size
Give it the name you want and specify the port and channel to be used. In this example the outbound call will go out on channel 12 of port 1.
Click on the 'Inbound VoIP Rules' radio button and add a new rule as shown below:
Please click on the image to display it full size
You can then specify a called party number or a VoIP endpoint (or both). General filtering rules apply here - refer to the Dialogic Media Gateway documentation for more information.
In the 'Outbound Routes' frame, select the newly created Trunk Group as the outbound destination (circled in green in the example).
Make sure to move the new rule to the top of the list so that it gets matched before other rules that could have similar CPID or hostgroup matching rules.
Submit the new settings.
Go to the Trace/Logging screen.
Click on the Configure button for the TDM Capture and select the channel that was defined in the new Trunk Group, 12 in our example:
Please click on the image to display it full size
Click on Start.
Reproduce the problem quickly to avoid capturing too much silence; the capture starts immediately even if no call is active on the channel.
After reproducing the problem, click on Stop and then Download to get the recorded WAV file onto your PC.
Note:
If the trace is left for too long, the WAV file can grow rapidly and may induce a lock up of the DMG2000 gateway. Therefore, do not leave it running for longer than necessary.
Product List:
Dialogic® 2000 Media Gateway Series
First published: 15-Dec-2009
Last published: 05-Sep-2014
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