[VoiceOps] Easy ways to measure PDD
miconda at gmail.com
Tue Apr 21 06:44:53 EDT 2015
On 21/04/15 06:18, Peter Beckman wrote:
> A friend suggested this:
> * Pipe the live pcap output to something that decodes the SIP packet
> * If it is an INVITE, write the timestamp to a file named the CallID
> (may need to be bucketed by the first 3 characters of the callID)
> e.g. 4/9/9/4991c62d0c46cf37603d3e9675b74d4a-10.9.8.7 contains
> * If it is a progress message
> * find the file
> * read the timestamp in the file
> * calculate the delta
> * determine the carrier based on the IP
> * post the metric
> * delete the file
> * Otherwise do nothing (discard)
> To keep things cleaned up you could run a cron job every 20 minutes that
> would delete files older than 3 hours (our max call length).
If I would have to code it and do it in C (for performance reasons),
perhaps I would go for patching sngrep (already mentioned here) or sipgrep.
sngrep already has options to display duration of singaling and duration
of connecting, so could be easy to track the places in the exiting code.
On the other hand, I am not sure if it would be easy to just write
reports to files instead of displaying with ncurses on the terminal.
Main reason for replying here is to point to wireshark/tshark, which has
embedded Lua support. That could be handy for non-C programers and the
performances are still high. Searching on google for wireshark+sip+lua
will reveal several examples that can be used as a starting point.
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