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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

disable dahdi pri

On Thu, Mar 15, 2012 at 05:44:53PM +0100, Johann Steinwendtner wrote:

> is there a way to disable a span for maintenance purpose (i.e. send yellow alarm) ?
This could be a good feature to add to the dahdi_maint utility.

> What would be the correct ioctl definition ? DAHDI_MAINT seems not to be the right
> candidate.
You could add an additional context in the DAHDI_MAINT ioctl handler of your
base card to set/unset the yellow alarm bit in the framer. For an example, see
the Yellow Alarm handler in t4_check_alarms() and the DAHDI_MAINT ioctl handler
in t4_maint() in drivers/dahdi/wct4xxp/base.c

> Would DAHDI_SHUTDOWN send an alarm ?
No. This will shutdown the entire card.



Sometimes calls on Asterisk fail to connect to DAHDI channels and giving
below error:

Unable to create channel of type ‘DAHDI’ (cause 34 – Circuit/channel

There are 8 E1 connected on server and only 15-20 simultaneous calls. All
channels and E1 are showing in service without any alarms.

Could anyone please let me know why this is happening?


PRI “wanrouter status” shows disconnected – system problem or Telco?

Hi everyone,

I am reading through Sangoma Wiki right now. But someone may already and
quickly notice this. I have a system that is down since the morning (maybe
power intruptions). All seems fine except for “wanrouter status” shows
disconnected. Following are the alarms raised. Should I call telco (they
have long wait times) or should I just keep searching online for
troubleshooting tips. “*wanpipe1 | AFT TE1 | N/A | Disconnected |”
<<<<<* This is what shows.

root@pbx:~ $ wanpipemon -i w1g1 -c Ta

***** w1g1: T1 Rx Alarms (Framer) *****

****** w1g1: T1 Rx Alarms (LIU) ******
*Short Circuit: OFF*
*Open Circuit: OFF*
*Loss of Signal: ON*

***** w1g1: T1 Tx Alarms *****


***** w1g1: T1 Performance Monitoring Counters *****

Line Code Violation : 0
Bit Errors (CRC6/Ft/Fs) : 0
Out of Frame Errors : 0

Rx Level : < -36db

root@pbx:~ $ ifconfig
w1g1 Link encap:Point-to-Point Protocol
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:4383
collisions:0 txqueuelen:100
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Interrupt:177 Memory:f8c50000-f8c51fff

root@pbx:~ $ wanrouter hwprobe verbose

TDM410 and DSL

Hi all,
I have a system installation in Guam with two trunks. One has a DSL service
riding on it with the usual filter. That channel however keeps throwing
alarms. I bypassed the filter and it stopped throwing alarms, but of course
the high frequencies annoy the users. I swapped the filters and the alarms
came back.

Any suggestions? Could I have a bad DSL modem?