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Asterisk – How to Host a PRI Circuit with a Sangoma Card

These are just a few quick notes of mine on how to host a PRI circuit from a Sangoma card in an Asterisk server to another Asterisk server or wherever for that matter.

This config here is for a Sangoma A102 with two ports and Asterisk will provide the clocking source. Channels 1-23 will be the B channels and channel 24 will be the D channel for signaling. Echo cancelling will be enabled as well.
/etc/dahdi/system.conf

#autogenerated by /usr/sbin/wancfg_dahdi do not hand edit
#autogenrated on 2015-08-28
#Dahdi Channels Configurations
#For detailed Dahdi options, view /etc/dahdi/system.conf.bak
loadzone=us
defaultzone=us

#Sangoma A102 port 1 [slot:4 bus:6 span:1] 
span=1,0,0,esf,b8zs
bchan=1-23
echocanceller=mg2,1-23
hardhdlc=24

#Sangoma A102 port 2 [slot:4 bus:6 span:2] 
span=2,2,0,esf,b8zs
bchan=25-47
echocanceller=mg2,25-47
hardhdlc=48

Continue reading “Asterisk – How to Host a PRI Circuit with a Sangoma Card”

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BackupExec 2012 – How to Limit CPU Usage and Disk I/O on RALUS with Cron Jobs

Backup Exec on Linux, otherwise known as RALUS, is great but it has no provisions for limiting it’s disk I/O or CPU usage during different periods of the day. Unfortunately, BE for Windows doesn’t have that option either, so get on it Symantec, nudge, nudge.

If you’re like me, you might have backup jobs on File Servers that span several terabytes worth of data that can essentially run for a day or two on their own. The problem is that people get really bitchy when things don’t run at the normal speed that they are used to and the inconsiderate assholes don’t give a shit when you explain why.

Well here are a few cron job tasks that I came up with to help relieve some of that pressure on your file server. Continue reading “BackupExec 2012 – How to Limit CPU Usage and Disk I/O on RALUS with Cron Jobs”

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Adtran TA924 PRI Conversion – Routing Inbound DIDs to FXS Ports or via a SIP Trunk to Asterisk and Allowing Bi-Directional Communications Between the Two

I have to say, I’ve worked with the Adtran TA924 Gen1 and Gen2 in the past and thought it was a great product then, but here recently I’ve just rediscovered the amazing flexibility of this unit and I am extremely impressed.

I’ve used the TA924 with a SIP trunk from both a Metaswitch and Asterisk before to convert to analog FXS ports and have had great success. It has always been rock solid but even back when the device was still in it’s infancy stages, it had a few limitations. I remember specifically when the unit could only do a PRI into a PBX and that is certainly no longer the case any more. There doesn’t seem to be anything this unit can’t do at this point. <3

At work, we had around 20 plus regular POTS lines through AT&T and were getting massively raped over the past several years (every year our prices have went up and at the time of porting our numbers out, we were looking at $74 dollars per POTS line and not including usage charges. Effing ridiculous. That is why I hate AT&T and refuse to support them, not to mention all their NSA spying garbage.) and I got a great deal on a PRI through our fiber internet provider so I needed a way to sort of peel out some of the channels into fax lines with DIDs and then bring the rest of the lines into my Asterisk server. In comes my old TA924 Gen2, that was collecting dust on a shelf, to the rescue. Continue reading “Adtran TA924 PRI Conversion – Routing Inbound DIDs to FXS Ports or via a SIP Trunk to Asterisk and Allowing Bi-Directional Communications Between the Two”

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Firefox – Version 33 Update Causes Certificate Error in Webmin

Copied this highly useful info straight from this website. Very strange that I didn’t have this problem until I hit Firefox version 39 but it is possible that I just hadn’t administered that particular server for a long time in Webmin.

Recent browser versions (e.g. Firefox 33) refuse to work with older Webmin installs.

They give a sec_error_invalid_key error, offer a ‘Try again’ button, but do not offer an option to add an exception.

Firefox 33 no longer supports certificates with private keys smaller than 1024 bits.

You can replace your webmin certificate with a new one by running this command: Continue reading “Firefox – Version 33 Update Causes Certificate Error in Webmin”

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Linux – Force Remote Reboot of System

I ran into a problem yesterday where I could SSH into a remote machine but a majority of the bash commands weren’t working and were giving an “Input/ouput error”, including the shutdown command. Upon further inspection, this particular machine, which was a thin client with 128 MB of flash storage, had run out of drive space. The suggestion on this stack exchange article worked perfectly so I just wanted to document it here for my own future reference.

As long as you have root access, you can run the following command to force a system reboot: Continue reading “Linux – Force Remote Reboot of System”

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MySQL Script – Alter/Convert All Tables in a Database from MyISAM to InnoDB

Pieced together from various tutorials on the web with a lot of my own additions, here is a snippet of SQL that will alter or convert all tables in a database from “MyISAM” to “InnoDB”. As long as your MySQL user account has privileges to create stored procedures, all you have to do is simply edit the @DATABASE_NAME variable at the top of the script and run it in PhpMyAdmin if you’ve got it. Enjoy! Continue reading “MySQL Script – Alter/Convert All Tables in a Database from MyISAM to InnoDB”

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Bash Script – OpenMCU-ru Service Monitor -OR- Monitor and Automatically Restart a Service Upon Failure

I threw this service monitoring script together because occasionally the OpenMCU-ru process in the developmental versions can crash out on my Ubuntu Server from time to time, so I wanted it to auto-restart. The script could easily be modified and used for any other service you like, but it was written specifically for OpenMCU-ru and Debian based operating systems.

There are two pieces to this puzzle (which makes for an awfully pathetic and simplistic puzzle), the “/etc/init.d/mcu-monitor” startup script to run the monitoring script as a daemon and the “/usr/local/bin/mcu-monitor.sh” monitoring script itself, both are fairly simple and straight forward. Continue reading “Bash Script – OpenMCU-ru Service Monitor -OR- Monitor and Automatically Restart a Service Upon Failure”

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Adtran Total Access TA924 – SIP Configuration for Asterisk

Here is a scrubbed working configuration for an Adtran TA924 SIP connection to an Asterisk server with a couple of noteworthy points:

  • The internal feature codes of the Adtran have been disabled with the “voice feature-mode network” command. As long as your Adtran’s internal dialplan supports it, feature codes can be passed through to Asterisk.
  • With the “accept $ cost 0” statement on the “NETWORK” trunk group, the Adtran dialplan simply passes off all traffic to the network.
  • Three way calling has been disabled with the “voice call-appearance-mode single” command.
  • Call waiting has been disabled with the “no call-waiting” command per SIP registration.
  • G711u is the only codec enabled by choice.
  • There is an example of how to connect an FXS port to a SIP user.
  • There is an example of how to set transmit/receive gains on an FXS port.
  • There is an example of how to register an extension range of 7000-7023 to an Asterisk server.

Continue reading “Adtran Total Access TA924 – SIP Configuration for Asterisk”