What actually happens when I press green calling key on my Cell Phone ? How do I get a call on my cell ? What the hell is '4G'?
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The A interface exists between the circuit switched domain of the CDMA network subsystem (NSS) and the base station subsystem (BSS). In terms of entity, it is the interface between the MSCe/MGW and BSC.
The A interface complies with the base station subsystem application part (BSAP) of signaling system SS7. It includes voice channels and signaling channels. The A interface is used to transmit the following messages:
The zz interface exists between two MSCes. It complies with the SIP with encapsulated ISUP (SIPI).
The zz interface provides the inter-office call control function for the narrowband circuit-switched domain services that are independent of the user plane bearer technology and the control plane transmission technology.
The T1 interface exists between the MSCe and the SCP. It complies with the WIN of the SS7 to support the intelligent network service 9. ISUP Interface When the MSC serves as a gateway office, it provides the interface between the PSTN and other mobile network devices. It also controls the incoming calls and outgoing calls through ISUP or TUP of the SS7