Hey Brian -
I've used Empirix/Hammer in the past but found the ongoing cost,
maintenance and complexity wasn't worth it.
We recently deployed VoIP Monitor to our remote POPs feeding back to a
central VoIP Monitor box with a nice front end.
I'm very happy with the solution.
http://www.voipmonitor.org
- Chris
On 12 Feb 2014, at 16:02, Gast, Jim wrote:
Hi, Brian -
If your VoIP endpoints can give you RTCP-XR (RFC-3611), turn it on.
You can harvest the "Statistics Summary Report Block" for Jitter and
Packet Loss stats and the "VoIP Metrics Report Block" for things like
MOS score. All of these stats are from the viewpoint of that
particular VoIP endpoint. They aren't very good at helping you find
the site of packet losses, but they are great at telling you whether
or not you have a problem.
Cheers,
/ Jim Gast, TDS Telecom
From: VoiceOps [mailto:[email protected]] On Behalf Of
Brian Knight
Sent: Wednesday, February 12, 2014 2:15 PM
To: [email protected]
Subject: [VoiceOps] VoIP passive monitoring appliances or software -
any recommendations?
$DAY_JOB is at a national ISP/NSP where we resell VoIP services. We
do peering with the VoIP carrier at one of our remote POP's. We are
looking for a better way to be able to monitor the handoff of those
calls to our carrier over that peering link.
We have quite a bit of instrumentation within our walled garden to
tell us about call quality. We can monitor our QOS policies to ensure
packets aren't being dropped by intermediate routers. If the customer
uses our routers to terminate their SIP session, we can pull call
quality stats from those routers as well. We can also use our own
office telephones to make and receive test telephone calls, and we can
of course run Wireshark captures from the switches to which those
phones are connected.
However, we can't say for certain that the customer's RTP traffic
actually made it on the wire connecting us to the VoIP provider, nor
can we say that the traffic is being transmitted and received
properly. The peering link is connected to a Cisco 12k router on our
side, so there is no way (afaik) to mirror the port, as on a switch.
For the moment, I am envisioning that we'll need to deploy a server
running Wireshark to the remote POP. It will need two network
interfaces; one connected to a management network, the other a capture
interface. The capture interface will connect to a network tap, and
the network tap connected in-line between our router and the patch
panel.
Wireshark is probably adequate for what we need. But I'm wondering if
there is any software or an appliance that would do the job better.
Given the usual details - calling number, called number, date and time
- we want to be able to quickly inspect traffic and dig into the
details of the stream. Do we see any missing packets from the media
stream? What is the MOS score of a particular call? Do we see any
missing packets coming from us? Any missing packets from the
provider?
Alerting on bad call quality would be a nice-to-have addition.
Any recommendation would be appreciated. Thanks in advance.
-Brian Knight
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