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My client have IP Phones connecting through internet and the quality is not good. Is there any software to log down  the internet bandwidth / performance such that we can study the internet bandwith at the time the quality turn bad ?

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Luis MouraCommented:
Ken BooneNetwork ConsultantCommented:
If you want to see the bandwidth utilization I would recommend something that uses SNMP to poll the interface statistics.  Something like Cacti - of which I would recommend pulling down the CactiEZ distribution - sets up in like 20 mins:

You can also use Solarwinds free tool bandwidth monitor

Since you want internet bandwidth statistics, then you will need to be able to configure SNMP on your internet facing firewall or internet facing routing.  

Both of these tools will help.
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madunix (Fadi SODAH)Chief Information Security Officer Commented:
AXISHKAuthor Commented:
Those tools tells the whole throughput of the interface, but can it tells the latency for the connection ?

Where should I monitor, on the client's network interface or interface connecting to the internet router ?

How to monitor the port if the port can't support mirroring as the port is occupied by the device ?

Tks again.
AXISHKAuthor Commented:
For CactiEZ, can it be installed on Window platform .  Tks
Yes, Wireshark can help identify issues with latency.

Are these calls coming across a PRI?  Analog?  SIP trunks?

Please also read the "User experiencing poor SIP call quality" section in

You can always use a network tap to monitor the port in question.
AXISHKAuthor Commented:
Any model reference for network tap ? Is it expensive ?

Any tutorial of using Wireshark to identify the latency ?

Tks again.
Ken BooneNetwork ConsultantCommented:
So for Cacti you don't need a mirror port, you need to configure snmp on the device i.e. switch, router, firewall..etc..  then Cacti will poll that device every minute and start charting the bandwidth utilization on the interfaces you specify.  It will also show you latency between cacti and the device, but you are more concerned with latency on your voice stuff which wireshark can help with as mentioned above.
AXISHKAuthor Commented:
How can I use wireshark, as it search a lot of data and I have no idea how to analyze it ?

Ken BooneNetwork ConsultantCommented:
so wireshark will need a mirror port or tap.  If you don't have that start with cactiez.  You can monitor the bandwidth utilization of your devices with snmp.  You can configure the SIP device at the provider in cacti and just monitor via icmp.  That will at least give you icmp latency between the cacti server and the provider SIP trunk.  

That will get you started anyway.
If you have an old hub lying around, it will get you started.

Please see the video on VOIP troubleshooting: 

Along with plenty of youtube tutorials, you could read up on to help with learning to use Wireshark. This is the only tool you'll need to identify jitters, latency and the like.
madunix (Fadi SODAH)Chief Information Security Officer Commented:
>>>Those tools tells the whole throughput of the interface, but can it tells latency for the connection
The major network performance metrics are latency (since the information needs to cross through different device) and throughput, you could use netpipe for latency and iperf for bandwidth performance. Notice: Latency , Loss and Jitter, these parameters mainly depend on the Quality and utilization of the links.
AXISHKAuthor Commented:
Thanks for the grade. Good luck.
Leon AdatoHead GeekCommented:
SolarWinds also has a free tool that monitors IPSLA. Your voice gateway (router) has to support that feature, but if it does, you can get a wealth of information about call quality without needing to learn how to dumpster dive through a pile of data:
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