The Telecom Protocols

M3UA  is a protocol for supporting the transport of any SS7 MTP3-User signaling (e.g., ISUP and SCCP messages) over IP using the services of the Stream Control Transmission Protocol (SCTP). In addition, provision is made for protocol elements that enable a seamless operation of the MTP3-User peers in the SS7 and IP domains. This protocol would be used between a Signaling Gateway (SG) and a Media Gateway Controller (MGC) or IP-resident Database. SG: SG is a Signaling Agent, which interface between the SS7 and IP network. It appears the SS7 SP to the SS7 .  SG is logical entity with contains the one of more SGP. SGP: SGP is logical instance of SG. SGP is a physical entity, which has the association between to ASP. All SGP within the SG have the view towards the SS7 Network. AS: AS is a logical entity, which serves as a specific Routing key. It is present in IP domain. An AS contains set of one or more ASP. There is 1:1 mapping of AS to r...

SCTP  is designed to transport PSTN signaling messages over IP networks, but is capable of broader applications. SCTP is a reliable transport protocol operating on top of a connectionless packet network such as IP.   It offers the following services to its users: - Error Free, Non-duplicated transfer of user data. - Data fragmentation. - Optional bundling of multiple user message in one single SCTP packet. - Fault tolerance using the multi-homing. SCTP provide following features: - it is transport layer protocol, like TCP and UDP. - It is unicast protocol communication between 2 endpoint. - It is session oriented protocol. it creates association between the endpoint. Endpoints are identified by the IP address and logical port number. - It provide the multihoming - more than one IP address of one endpoint to provide the multi-path, endpoints are identified by the port number. Only one path (association) can be active at a given time...

SIGTRAN (Signalling Transport) is a set of protocols defined to transport SS7 messages over IP networks. SIGTRAN allows IP networks to inter-worked with the Public switched Telephone Network (PSTN) and vice-versa. The Sigrtan protocol stack based on following components: - A Standard IP stack. - A common signalling transport protocol, that we called as SCTP (stream transmission Protocol) - Adaptation Layer: These are the Adaptation layers for MTP2, MTP3 and ISUP, called M2PA, M2UA, M3UA, and SUA. SIGTRAN Stack :

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...