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install realtime Kernel and Kernel Headers:
 
apt-get install -y linux-image-rt-amd64 linux-headers-rt-amd64
 
remove the old kernel
 
apt-get remove -y linux-image-3.2.0-4-amd64 linux-headers-3.2.0-4-amd64
 
update-grub ##reconfigure the bootloader for the new Kernel
 

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A2BILLING INSTALLATION GUIDE
0. Sypnosis

A2Billing is a voip billing software licensed under the AGPL 3. Copyright (C) 2004-2015 - Star2billing S.L. http://www.star2billing.com/

This document focuses on the installation of A2Billing system for the Asterisk open source PBX. The document covers the installation and basic configuration of A2Billing. A2billing is an open source implementation of a telecommunication billing and added value services platform.

A2billing is a LAMP (Linux/Apache/Mysql/PHP) application that interfaces with Asterisk using both the AMI and AGI interfaces.

This documentation has been tested using Ubuntu 12.04.

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Tom Barthel`s Vicidial on Debian Wheezy 7.5 Scratch install

This Tutorial is testet on a 5 Dollar KVM VPS on http://www.vultr.com/?ref=6804483

Vultr is great for testing. you can set up a Vicidial server from  scratch or 
Vicibox in shortest  time. On 4 Continents total of 12 cities.

For production use, please use a dedicated server, for example, 
of www.ovh.com My customer number is bt81421-ovh you can specify 
when ordering., then I get a small commission

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How To Install Goautodial From Scratch CentOS 64bit (CentOS 7)
1. Install minimal version of CentOS 7 64bit
2. Install the Goautodial yum repository

cd /etc/yum.repos.d/
wget http://downloads2.goautodial.org/centos/7/goautodial.repo

3. Update system

yum install -y epel-release

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    sudo aptitude install pptpd

Edit the “/etc/pptpd.conf” configuration file:

    sudo vim /etc/pptpd.conf

Add to it:

    localip 192.168.1.5

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For the manual installation start with updating your server or skip to next command.

yum update

In case you want to install the package without updating all the packages make sure that kernel, kernel-devel and kernel-headers are exactly the same version, example 2.6.32-431.20.5.el6. Use the command:

yum install kernel-devel-`uname -r` iptables-devel kernel-headers-`uname -r`

Disable the selinux for the moment. After the installation use selinux tools to apply the right policies to the folders otherwise iptables will not start.

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Dhrystone 2 using register variables      207510114.7 lps   (10.0 s, 7 samples)
Double-Precision Whetstone                    26893.1 MWIPS (9.5 s, 7 samples)
Execl Throughput                              26071.9 lps   (29.7 s, 2 samples)
File Copy 1024 bufsize 2000 maxblocks       1071865.9 KBps  (30.2 s, 2 samples)
File Copy 256 bufsize 500 maxblocks          294748.9 KBps  (30.2 s, 2 samples)
File Copy 4096 bufsize 8000 maxblocks       2977406.3 KBps  (30.1 s, 2 samples)
Pipe Throughput                            14004474.8 lps   (10.0 s, 7 samples)
Pipe-based Context Switching                2424947.2 lps   (10.0 s, 7 samples)
Process Creation                              66847.7 lps   (30.0 s, 2 samples)

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Benchmark Run: Fri Mar 11 2016 19:40:16 - 20:08:34
2 CPUs in system; running 2 parallel copies of tests

Dhrystone 2 using register variables       75960005.8 lps   (10.0 s, 7 samples)
Double-Precision Whetstone                     9289.1 MWIPS (9.8 s, 7 samples)
Execl Throughput                              11182.8 lps   (29.9 s, 2 samples)
File Copy 1024 bufsize 2000 maxblocks       1480895.8 KBps  (30.0 s, 2 samples)
File Copy 256 bufsize 500 maxblocks          393910.4 KBps  (30.0 s, 2 samples)
File Copy 4096 bufsize 8000 maxblocks       3989186.7 KBps  (30.0 s, 2 samples)
Pipe Throughput                             4816611.8 lps   (10.0 s, 7 samples)

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Dhrystone 2 using register variables       41324610.4 lps   (10.0 s, 7 samples)
Double-Precision Whetstone                     4179.4 MWIPS (12.4 s, 7 samples)
Execl Throughput                               6245.8 lps   (30.0 s, 2 samples)
File Copy 1024 bufsize 2000 maxblocks       1223466.6 KBps  (30.0 s, 2 samples)
File Copy 256 bufsize 500 maxblocks          368589.8 KBps  (30.0 s, 2 samples)
File Copy 4096 bufsize 8000 maxblocks       2460704.4 KBps  (30.0 s, 2 samples)
Pipe Throughput                             2891629.0 lps   (10.0 s, 7 samples)
Pipe-based Context Switching                 541495.7 lps   (10.0 s, 7 samples)
Process Creation                              11355.1 lps   (30.0 s, 2 samples)

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------------------------------------------------------------------------
Benchmark Run: Sun Jul 26 2015 08:02:09 - 08:30:32
1 CPU in system; running 1 parallel copy of tests

Dhrystone 2 using register variables       36933433.4 lps   (10.0 s, 7 samples)
Double-Precision Whetstone                     4455.9 MWIPS (10.7 s, 7 samples)
Execl Throughput                               4721.5 lps   (29.7 s, 2 samples)
File Copy 1024 bufsize 2000 maxblocks       1085636.5 KBps  (30.0 s, 2 samples)
File Copy 256 bufsize 500 maxblocks          338751.6 KBps  (30.0 s, 2 samples)
File Copy 4096 bufsize 8000 maxblocks       2244759.8 KBps  (30.0 s, 2 samples)