Best Strategy To Find And Solve Voice Quality Problems

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Hi,

in my company we use an asterisk installation with around 50 soft- and hardphones of all kind. From time 2 time the users (almost only Softphone users) report some voice qualities… mostly echoes. These problems do not occur on all PCs at the same time and since setup of our PBX almost any PC user has gotten these issues. When I come there to check, everything is fine again… and I canĀ“s see anymore, what could have caused the problem… may it be a high network load, or a high cpu usage or whatever… I activated call recording to “hear” the quality after such missing-quality reports but every call I listened to showed no issues in the recording so I assume the problem is on the client side. Because it is not always the same user or the same PC I think it cannot be a misbehaviour like wrong headset usage or a problem of a single PC.

What is the best strategy to find and solve these kind of problems? Are there any (free would be cool) tools that can monitor the pc-state (concerning at least network and cpu- /
process usage) over a long period and display the results in an appropriate way?

Is there a way under Windows XP / 7 to ensure Bandwidth for VoIP like QoS (google only showed me such
“settings” for Lync or Windows Server machines…?

Is there a way under Windows XP / 7 to ensure CPU-Bandwidth for Applications (like VoIP Clients)?

Thanks for any hint, yves