Telephone Network Services

You can develop telephony service providers for a variety of telephone network services and technologies, including:

• POTS (Plain Old Telephone Service) Voice and data are transmitted in analog format while in the local loop and are digitally transmitted elsewhere. Typically, one media mode per call, one channel per line.
• ISDN (Integrated Services Digital Network) Transmitted digitally. Speeds of up to 128 Kbps on Basic Rate Interface (BRI-ISDN) lines and much higher on Primary Rate Interface (PRI-ISDN) lines. At least three channels and as many as 32 channels, for simultaneous, independently operated transmission of voice and data. International standard.
• T1/E1 Transmitted digitally. T1 is a transmission link with a capacity of 1.544 Mbps, typically used for connecting networks across remote distances. In Europe T1 is called E1.
• Switched 56 Signaling at 56 Kbps over dial-up telephone lines, but requires special equipment. Limited to calls to other specially equipped facilities.
• CENTREX Centralized network services through regular telephone lines and using telephone company equipment. No special equipment required.
• Digital PBXs (private branch exchanges) and key systems Voice and data transmitted on private telephone systems using proprietary interfaces.