The IRVAS service is realized through the SG and the IN platform, and is only applicable to the GSM network. SG intercepts the location update signaling and call routing signalings of a subscriber, reports the information of the subscriber to the IN platform. Under the instruction of the IN platform, it modifies the subscribers Terminating CAMEL Subscription Information (T_CSI) or MSRN and triggers the callee oriented IN service of the subscriber over the IN platform so that the subscriber can enjoy individualized IN services during international roaming. For example, virtual home environment (assistant dialing and adaptation to the subscribers dialing habit) and roaming services (realtime charging for pre-paid roaming subscriber and realtime charging for postpayment subscriber).

Associated terms:

MSISDN

Every Mobile Station (MS) has two numbers: MSISDN and International Mobile Subscriber Identity (IMSI). The MSISDN is the directory number used for making a phone call. The IMSI is the identification number used by the service provider for identifying an MS.

IMSI

The IMSI uniquely identifies an MS. It consists of three parts:

• MCC: mobile country code
• MNC: mobile network code
• MSIN: mobile subscriber identification number

The IMSI enables the carrier to identify an MS, search the address of the MS, and authenticate the MS. When a subscriber applies for the mobile telecommuncation service, two numbers will be allocated to the subscriber: MSISDN and IMSI.

T_CSI

Not all subscribers can enjoy IN services. The concept of CSI is introduced to indicate whether a subscriber is an IN service subscriber. If a subscriber has an allocated CSI, the subscriber can trigger an IN service. The CSI for triggering the IN services mainly includes O_CSI and T_CSI, which correspond to the caller and the callee respectively. O_CSI, together with other subscriber data, is saved in the HLR. During the location updating process, it is sent to the VLR. T_CSI is saved in the HLR. In the process of obtaining the roaming number, it is taken from the HLR.

OUTBOUND

When a subscriber of the local network roams to other areas, the subscriber is referred to as an outbound subscriber.

INBOUND

When a subscriber of other networks roams to the local network, the subscriber is referred to as an inbound subscriber.

 

Benefits to carrier:

The carrier can acquire the information of the international roaming subscriber and control the callee oriented IN services to realize convenient charges management. In this way, the carrier can cut the roaming cost, increase revenues from roaming, improve the subscribers satisfaction level, and popularize its brand name.

Benefits to Subscribers:

During international roaming, the subscribers can enjoy individualized IN service conveniently.

Software/Hardware requirements:

The IRVAS service is provided in V200R003 and later versions.

The IRVAS service has no special requirement on hardware.

 

 

useful document, thanks