MSRN

REMORA Category: M


The Mobile Subscriber Roaming Number (MSRN) plays a crucial role in ensuring that incoming calls are correctly routed to a roaming mobile station. When a mobile station roams into another numbering area or country, it needs a temporary MSRN, which is typically assigned by the visited network. Here’s how it works:

  1. Initial Registration: When a mobile station roams into a new network (usually in another country), it registers with the visited network. During this registration process, the visited network may assign a temporary MSRN to the roaming mobile station. This MSRN is used for routing incoming calls to the roaming user while they are in the visited network’s coverage area.
  2. Home Location Register (HLR): The MSRN is associated with the mobile station’s information in the Home Location Register (HLR) of the home network. The HLR is responsible for storing subscriber information and is used to forward incoming calls to the mobile station.
  3. Incoming Call Routing: When someone calls the roaming mobile station, the call is first directed to the home network based on the mobile station’s original phone number (MSISDN). The home network queries the HLR to retrieve the current MSRN assigned to the roaming mobile station.
  4. Forwarding to Visited Network: The home network then forwards the call to the visited network using the MSRN. The visited network uses this MSRN to locate the roaming mobile station and deliver the call to it.
  5. Per-Call Basis: In some cases, especially for temporary or infrequent roaming, the MSRN may be assigned on a per-call basis. This means that the home network requests the MSRN from the visited network for each incoming call before routing the call to the visited network.

Overall, the MSRN ensures that incoming calls to a roaming mobile station are correctly directed to the network it is currently using, whether the MSRN is assigned during initial registration or on a per-call basis. This helps maintain seamless communication for mobile users while they are away from their home network’s coverage area.