Legacy Telephony
Legacy Telephony refers to traditional telephone systems and technologies that predate modern Voice over IP (VoIP) and digital communication methods. It encompasses analog and early digital systems like Public Switched Telephone Network (PSTN), Integrated Services Digital Network (ISDN), and Private Branch Exchange (PBX) hardware. These systems rely on circuit-switched networks to transmit voice calls over dedicated physical lines.
Developers should learn about Legacy Telephony when working on migration projects, maintaining legacy business systems, or integrating with telephony infrastructure in industries like finance or healthcare that still use older systems. It's crucial for understanding telephony protocols (e.g., SS7, ISDN PRI) when developing or debugging applications that interface with traditional phone networks, such as call centers or emergency services.