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Signaling System 7 (SS7) Gateway Solution for Internet Access
PDF of this tutorial5. Processes of the SS7 Gateway
The main processes of an SS7 gateway include the following:
- SS7 stack—The stack must be based on existing standards.
- SS7 call routers—The call routers are based on the system call-router process in the ECTF architectural framework. There will be one or many instances of this process in a single gateway.
- call manager—This process is one of the main elements of the gateway application. This process is implemented as a finite state machine maintaining the call state for each instance of a call between an end user and a port on an NAS. The main purpose of this process is to convert the messages into a set of generic NAS interface messages. This process is developed as an S.100-style application. There will be a few instances of this process in any gateway system. Each call-manager process will support a configurable number of ports.
- NAS line controller—To handle the transactions between the NAS units and the gateway, a set of separate processes, called NAS line controllers, was designed. Each of these processes can be configured to support connectivity with a specified number of NAS units. This process is the only NAS–dependent process in this architecture. However, this generic design can be easily modified to support devices from any or all of the major networking companies.
- operation user interface—The operations character user interface (OCUI) provides a messaging and user utility. OCUI provides an interface between the user or craft worker and the NAS to perform craft functions.
- alarm manager—The alarm-manager server is a background process that provides a centralized receptacle for alarm events. The alarm-manager process consists of several processes.
