Here is a sample on running a service to startup in centos:
A2Billing configuration on FreePBX
Here is the step by step instruction on how to configure a2billing with FreePBX 2.4:
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Hotline calls (PLAR) with Asterisk
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Hotline/Warmline, also known as Private Line Automatic Ringdown (PLAR), is a line used for priority telephone service. When using with a SIP phone you must make sure the phone supports this feature. As of this writing I know that Polycom SIP phones support sending a signal to Asterisk upon the offhook event.
Cisco 7912 with Asterisk
Asterisk phone lock/unlock feature
Below is a simple and intuitive dialplan by which you can add the phone lock feature to your Asterisk system. Take note that the provided dialplan only locks the phone from calling out to PSTN.
Cisco ATA 186 + Asterisk
The Cisco ATA 18X series can run either SCCP, H323 or SIP voice protocols making it very flexible.
Another note of importance is that they do not support two ports running the G.729 codec simultaneously. If one port is using G.729, the other will use G.711. In this manual we are using a SIP firmware (ata_03_02_04_sccp_090202_a). If you want to update to other firmwares or perhaps protocols, I suggest you read the last 2 links provided in the resources section.
Asterisk + Cisco IP phones 7940G and 7911G
For configuration you can refer to the following 2 links
Configure Cisco IP Phones with Asterisk
Cisco IP Phones 79XX with Asterisk
Add Persian Language to Asterisk
In order to add Persian language we need to do some modifications on the Asterisk source code. For that, download the same Asterisk version as your current one (in case you’re using FreePBX/Trixbox). The main thing to change is the Asterisk say digits. Here is what must be changed:
Skype Connect in FreePBX
To get Skype for SIP (Skype Connect) to work with FreePBX follow these steps:
Connect to MS-SQL server from PHP-Linux
Having searched for quite a long while, here is how I figured out the way to connect to a Microsoft SQL server from Linux using PHP mssql extension module. (Thanks to Danne Lundqvist)