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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...

SIP SIP standards for Session Initiation Protocol and It's Purely IP based.  BRI/PRI PRI stands for Primary Rate Interface and It contains One 64Kbps T1 or E1 Chanel for Signaling AKA Channel D and 23 T1 or 30 E1 Channels as Bearing Chanel aka Channel B.\ BRI standards for Basic Rate Interface and Contain Two Barer channel and One Signaling Chnnel AKA 2B+D. Further Both Both PRI and BRI are ISDN services and also data rate of PRI is 2.048Mbps while 128-144Kbps. ISDN : Integrated Service Digital Network / It's Some Dumb Network SIP vs BRI/PRI SIP does Best effort Delivery as same as IP traffic do, while BRI/PRI Provide QoS. If someone requires to attain QoS through SIP something like MPLS will do with a considerable amount cost. SIP is more flexible than BRI/PRI because it can be accommodated by company existing data network while BRI/PRI reuires to have a dedicated link for it self.