Interconnection of PSTN and Internet Telephony

PBX

• Computer-telephony integration (CTI) link
• LAN telephone system
• Ericsson; in Finnish

Hardware and Software

• Call Free Now
• Vienna Systems
• Vocaltec Telephony Gateway
• NetiGate
• Dialogic
• BICOM (ISA-based)
• Natural MicroSystems
• Pika Technologies analog and digital voice interface cards
• Digium FXO and T1 interface cards for Linux

Controlling Traditional Telephony

• Sprint's web-to-telephone service allows a web form to trigger a return phone call, but does not use the Internet to carry voice. Also, web pages can be used to set up PSTN conference calls.
• A Proposal for Internet and Public Switched Telephone Networks (PSTN) Internetworking
• Internet call manager displays incoming POTS call information while user is on-line
• Call Works interface to IVR (interactive voice response) systems

Internet-to-Phone

Internet to gateway to POTS

• Net2Phone (IDT)
• Global Exchange Carrier (GXC), also organizing a consortium of Internet telephony gateway operators. Their VoxBox connects an analog telephone to a PC.
• Call Works
• Others include Labs of Advanced Technology International Corp. and Network Long Distance (as reported in they NYT and WSJ).

Tail-End Hop-Off

Voice is carried across the Internet long-distance, but customers dial up a local number using POTS.

• Delta-3 (concentrates on countries with expensive international rates)
• USA Global ("rates of from $US0.25-$0.45 anywhere to anywhere")
• OzEmail Internet transit service in Australia

Last modified 1997-03-27 by Henning Schulzrinne