ping tests to prove where our network/internet problems is?

As above really.
We are trying to work out where and why our SIP calls are intermittently have very poor quality, quiet, echoed.  Were not losing packets as such (i think).

As usual our ISP say nothing wrong and telecoms co say its line..

We have ran a test ping on a number of IP's: google, switch, firewall, ISP hardware and our SIP provider IPs and response times are varying, but consistent.  I also see that the LAN switch on occasion has hit a response time of 40ms and 110ms during the tests (all ran at the same time.

Is this test reliable enough?
What other tools could help?

Thanks
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CHI-LTDAsked:
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Satyendra SharmaMicrosoft UC Technical ArchitectCommented:
If you haven't already i would highly recommend to deploy Monitoring reports so you can see the details of call and various other factors that may contribute to call quality problem.

It is the best way to look into the CDR and QOE statistics and plays key in troubleshooting voice issues.

Here more info on deploying and using monitoring
http://technet.microsoft.com/en-us/library/jj204874.aspx
http://technet.microsoft.com/en-us/library/jj687994.aspx
http://windowspbx.blogspot.com/2012/07/aaa-donotpost-install-lync-standard.html
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CHI-LTDAuthor Commented:
sorry, we arent using lync.
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