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Network Caller ID
Port 3333 is commonly used for the Network Caller ID (NCID) server service, an open-source system designed to distribute caller identification info across a network. It enables sharing caller ID information from a telephony input (like a modem or VoIP gateway) to various connected devices, such as PCs or media centers, enhancing call screening and logging across networked systems..
Network Caller ID (NCID) is an open-source client-server architecture designed to capture and distribute caller identification information across a local network. The NCID server typically listens on TCP port 3333, receiving incoming call data from modems or telephony gateways capable of forwarding caller ID signals. Once captured, this information is disseminated to multiple NCID clients connected over the network.
The server parses the caller ID data, which may include the caller's phone number, name, and call timestamp. Clients display this information to end users in real time, facilitating network-wide call monitoring. The NCID protocol is plaintext-based and lightweight, making implementation straightforward for various platforms including Linux, Windows, macOS, and embedded devices.
Integration with other software components such as media centers or home automation systems is typical; for example, to pause media playback on incoming calls or log call histories automatically. Since communication is unencrypted by default, deployments are most secure within trusted, private networks.