[c-nsp] Opensource tool to measure Jitter for VoIP

[Eric Van Tol]

> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-
> bounces at puck.nether.net] On Behalf Of Bryan Campbell
> Sent: Monday, June 08, 2009 8:46 AM
> To: Kasper Adel
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Opensource tool to measure Jitter for VoIP
> 
> 
> You cannot measure VOIP (sip) jitter using ICMP tools.  You will only
> isolate false positives when the ICMP is not doing well.
> 
> Route or mirror the customers traffic trough a monitoring station.  Run
> tcpdump or Wireshark to get a pcap file that contains traffic of
> interest.  Wash the pcap file through the Wireshark VOIP analysis tool
> to find your jitter.  It is a standard tool in Wireshark.
> 
> If you can't find jitter in this manner, it cannot be found.  If it
> cannot be found, it doesn't exist.
> 
> bbc at misn.com

What are the there legal ramifications to this?  While I like to think that "it's my network, I'll do what I want to measure its performance", I *think* that sniffing voice traffic without consent is considered wiretapping.  IANAL, but it would behoove you to get a consent form from your customer prior to taking this route, just in case.

-evt