MTD (mobile network)
MTD (mobile network) refers to Mobile Telephone Directory. It is a database or directory maintained by mobile network operators that contains information about subscribers, including their phone numbers (MSISDN), associated SIM card details (IMSI), service profiles, and potentially location information. This directory is crucial for routing calls and SMS messages, providing subscriber services, and managing network resources.
The MTD is a core component of a mobile network's infrastructure and is typically implemented as a distributed and highly available system to ensure reliable service. Information within the MTD is updated regularly as subscribers activate/deactivate services, change their plans, or port their numbers.
The information in the MTD is used for several key functions within the mobile network:
- Call Routing: Determining the correct network elements to route incoming and outgoing calls based on the dialed number.
- SMS Routing: Similar to call routing, directing SMS messages to the appropriate recipient based on the destination number.
- Subscriber Authentication and Authorization: Verifying the identity of a subscriber and authorizing access to network services.
- Service Management: Applying appropriate service profiles and restrictions based on the subscriber's subscription.
- Location Tracking: Used in conjunction with other network elements to determine the approximate location of a mobile device.
- Billing: Generating billing records based on usage data associated with the subscriber's account.
The security of the MTD is paramount, as unauthorized access could lead to fraud, service disruption, and privacy breaches. Mobile network operators employ various security measures to protect the MTD from unauthorized access and manipulation.