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The switching system (SS) is responsible for performing call processing and Subscriber-related functions. It is a combination of terminal equipment and subscriber data.The terminal equipment is called ME (Mobile Equipment) and the subscriber’s data is stored in a separate module called SIM (Subscriber Identity Module). The SIM card contains an identification number of the user and list of available networks.
If the visited network is outside the home country, this is known as international roaming.
If the visited network operates on a different technical standard than the home network, this is known as inter-standard roaming.
Establishing roaming between network operators is based on – and the commercial terms are contained in – dedicated roaming agreements.
If the visited network is in the same country as the home network, this is known as national roaming.
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This is not an example of the work produced by our Essay Writing Service.GSM Roaming, which involves roaming between GSM networks, offers the mobile subscriber the convenience of being able to use a single number, a single bill and a single phone.The convenience of GSM Roaming has been a key driver behind the global success of the GSM Platform.After the transaction, the connection is terminated.In a fixed telephone network, providing and managing connections is an easy process, because telephones are connected by wires to the network and their location is permanent from the networks’ point of view.The SIM card, which acts as your digital identity, is tied to your cell phone service carrier’s network rather than to the handset itself.This allows for easy exchange from one phone to another without new cell phone service activation.The GSM is a circuit-switched system that divides each 200 k Hz channel into eight 25 k Hz time-slots.Cell phones use GSM network by searching for cell phone towers in the nearby area.The GSMA’s GSM Coverage Maps are a unique resource containing information supplied and approved by the members of the Association.The network, services and roaming information are continually updated to reflect the evolving situation worldwide.