The Telecom Protocols

HEX VALUE                                                       CAUSE ---------------------------------------------------------------- 03                                                               No route to destination 06                                                               Channel unacceptable 08                                                               Preemption 0...

The Signalling Connection Control Part (SCCP) message are used by the peer to peer protocol. Following are the SCCP message used by the peer to connection oriented and connection less services. Application that uses the service of SCCP are called Subsystems. Refer the  SCCP structure for detail SCCP structure. Classes of service : • Class 0 —Basic connectionless class - it has no sequencing control. i does not impose any condition on SLS, therefore SCCP message can be delivered in out-of-sequece. • Class 1 —In-sequence delivery connectionless class - it adds the sequence control to class 0 service by requiring to insert the same SLS to all NSDU. • Class 2 —Basic connection-oriented class - Assign the local reference numbers (SLR,DLR) to create logical connection. it does not provide the flow control, loss, and mis-sequence detection. • Class 3 —Flow control connection-oriented class - Class 3 is an enhanced connection-oriented service that offers dete...

Intelligent Networks (IN) :-  Intelligent Networks is a concept service intelligence resides in a central node called an SCP and SSPs (residing on Switches) relinquish control to this node at particular stages in a call so that appropriate service logic can be applied. Objectives of IN: - Increased Service Velocity / Speed of Deployment - Increased Range of Services - Evolvability from Existing Networks - Service & Vendor Independent Implementation - MSC just focuses on core job of call processing Network Before IN:   Before IN application, there was messed network for every node: Network with IN : After IN implementation, Network is organised. Basic Concepts  – PIC and DPs & BCSM: Point In Call (PIC)  :  A state in a basic call state model. Detection Point (DP)  :  A point in basic call processing at which specific event is detected. Detection Points represent...