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Database Transactions with Perl To understand what is a database transaction lets look at a simple bank withdrawal and deposit scenario. Assume that you have two bank accounts call A and B, and you need withdraw some amount from account A and Deposit it on account B. In this scenario what happen if you couldn't withdraw money from your account A, the deposit part won't carry out. Again if you couldn't deposit the money to your account B you have to deposit them back on account A (Which means a roll back). So in the  context of Database, Transaction is refer to  a sequence of jobs which is supposed to run as a whole. So in other words, it should happen as whole or not. So as in our following example, we have 3 Database queries which should perform as a whole. Further assume that our first Database query is supposed to perform a insert if successful, second query  should update a table if successful, third query  should delete an entry from a ...

Asterisk Gateway Interface 1. What is Asterisk Gateway Interface?  In simple word AGI is Language Independent API to programmers to control the call flow on their Asterisk PBXs. Asterisk provides more than its own dial-plan, to control to the call flow or lets say call logics. So which means you may use either one of Dialplan Asterisk Manager Interface (AMI) Asterisk Gateway Interface (AGI) to manipulate your call logics. Before we move on to AGI lets briefly discuss about each one of above, Dialplan Dial plan is Asterisk native call logics performer, it's fast, easy to learn and efficient. But this configuration script is more closer to assembly program (If you have any previous experience on assembly), the main drawback of the Asterisk Dialplan in it's lack of support on standard procedural  language as an example when you want create a loop.  Any way in the following tutorials we will only discuss about the AGI, But we can't av...