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Recommended VOIP Monitoring Tools

As system administrator, monitoring the continuity of services is vital. Today I would like to highlight some tools that could come in handy for VoIP monitoring.


For those of you who didn’t know it, Nagios can be configured to monitor pretty much anything you want, including Asterisk servers. Actually, with Nagios the (much) harder part is deciding what’s relevant to monitor, and what your alarm thresholds should be set at.

Some VoIP community members have reported that they used Nagios to monitor ~4,000 hosts and about 8,000 to 10,000 services before they started running into scaling problems on a single box.

For this purpose you might want to take a look at Nagios’ NSCA (Nagios Service Check Acceptor), is a Linux/Unix daemon that allows you to integrate passive alerts and checks from remote machines and applications with Nagios. It’s useful for processing security alerts, as well as redundant and distributed Nagios setups.


This is a free and OpenSource Software written in Perl written by Tobi Oetiker, (the creator of MRTG and RRDtool) that keeps track of your network latency and can provide SIP Ping Probe capabilities. Between the functionality list it provides, we have:

  • Outstanding latency visualisation.
  • Interactive graph explorer.
  • Wide range of latency measurment plugins.
  • Master/Slave System for distributed measurement.
  • Highly configurable alerting system.
  • Live Latency Charts with the most ‘interesting’ graphs.

Monitor PBX (or Монитор АТС in russian, it’s original language)

The homepage of this tool (which is completely in Russian) says that it is an open source utility that allows real-time visualization of key performance indicators Asterisk based telephony server. And that it is designed to evaluate the performance of the system under test, and in commercial operation.

(I think they should really consider adding an English version of the website)


Sure there is a big span of very useful and extraordinary tools around. So far, taking ideas from the Asterisk Community I could recommend this two. If you know about any other tool that could be use for this purpose, don’t hesitate to contact me and I’ll get sure to mention it here.

Last Update: 01-Oct-2012

Stumped trying to find AGI script on my server ….. solved (I think)

Hi, I believe I’ve found out what this is – one of the previous developers probably left a shell session running Adhearsion in console mode, bless them!

India Telecom regulations

Hi All,
Because I am pretty sure we have people in this DL from India, I was hoping
to get the 100% accurate information, is it legal to make calls from any
coutry to Indian mobile phones through an Asterisk server based in India?

vigor 2920 problems

One of our clients has a Draytek Vigor 2920- their natted Snom phones
behind it are registered to an Asterisk 1.4 server on an external public IP.

I’ve set QOS, bandwidth management and turned off the SIP ALG via telnet
but I’m still having some problems with some of the phones losing
registration if Asterisk is restarted.

I can see the phones sending SIP REGISTER messages, but they never arrive
at the server; this happens in about half of the phones- with no
consistency as to which lose registration.

It looks like the router is swallowing the messages, or there’s some kind
of NAT problem. Other clients at other sites are fine.

The problem clears if the phone is rebooted (renegotiates a new nat path?)

Any help warmly appreciated.


cseq decreasing => 500 Server Error

Trixbox CE for Multi Tenant

HI ,
I have to configure a Trixbox CE server for Multi Tenant Companies. so can you please guide about it to me.