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Ken Fermoyle: Internet Phone Calls


Net Phone Calls:
Possible and promising,
but not always a piece of cake

by Ken Fermoyle

Have you tried making a phone call over the Internet yet? It's been possible, if not always a piece of cake, for more than two years. I became mildly interested in the spring of 1997, then got really into while researching several articles (for PC World, Newsweek and MicroTimes). I'd like to share what I've learned.

First, you should know the difference between conventional and Internet telephony. Conventional telephone networks use circuit switching. When a call is placed and answered, a circuit opens. The circuit remains open as long as the call lasts, so the line is tied up during that time.

Internet telephony employs packet switching, which breaks up data into small packets which co-mingle on the same line. Packets contains identifiers, addresses of where it came from and where it's going, so they can be sorted, routed and reassembled at the delivery point. When a packet is lost or corrupted by line noise, a duplicate packet is sent

You've come a long way, baby

Internet telephony has come a long way since its birth in 1996. Experts differ, however, on whether it's destined to be a child prodigy or a communications stepchild, stunted by politics and efforts of the giant telephone companies (telcos). Other problems include current Internet bandwidth restrictions and lack of product compatibility.

Software-only products allowed hard-core users to make the first free long-distance Internet phone calls. I used VocalTec's Internet Phone softtware for my first Net calls in early 1997. It was a free download and easy to install, but results were so-so. Making sure we all had current copies of the software and setting a mutually agreeable time to be online required mucho e-mail. Times delays were a nuisance and sound quality ranged from fair to barely intelligible at times. I couldn't see any viable business use for the technology at the time, and personal calls were cheap enough in off-hours or on weekends so that Net phoning wasn't worth the hassle.

Improved software and new hardware available solve many of the earlier problems. I acquired samples to check their effectiveness.

The Hardware Varies

The hardware I checked included Internet PhoneJACK, InfoTalk and Aplio Phone, all different but representative of currently available Net phone equipment. Software used included the latest version of VocalTec's Internet Phone, Microsoft's Net Meeting and IDT's Net2Phone. These were not objective, scientific tests, understand; just quick, subjective trials to see how the results compared with my earlier software-only Net phone calls and those I make every day using conventional phone service.

PhoneJACK is a Plug-and-Play DSP (digital signal processing) card that plugs into an ISA slot (half or full). It works alongside, but independently of, existing sound cards. It doesn't need a modem, and doesn't use a precious IRQs. It does include an RJ-11 POTS (Plain Old Telephone Service) port, RJ-12 headset port and 3.5mm connections for microphone and speaker. Its hardware-based compression technology reduces delay and CPU load on your system.

You can connect a standard phone to the PhoneJACK card and enjoy sound not too different from conventional phones. It's ideal if there is another PhoneJACK on the other end of the call, but that's not necessary. Even if the other party is only using such software as NetMeeting or Net2Phone, both parties benefit from PhoneJACK's better sound.

InfoTalk and Aplio/Phone, Net telephony devices from InnoMedia and Aplio, Inc., differ markedly from PhoneJACK in that they do not require a PC. Both plug in between a conventional phone and POTS wall outlet, serving as a mini-gateways to the Net.

They have two drawbacks. They use proprietary technologies, so parties on both ends of a call must use the same products. An InfoTalk phone cannot talk to an Aplio/Phone, or to any other IP Telephony device. Also, making a call is not as simple as just dialing a number. That's just the beginning.

After you dial and the call is answered, with InfoTalk, you tell the other party you want to make this an Internet call. Either party can then press the pound (#) key to initiate the Internet connection. When the connection is established, you can begin the conversation.

With Aplio/Phone, after making connection, either party can press the "APLIO" button on the device to switch the call from the long-distance carrier to the Internet. Both parties then hang up; in about 45 seconds, the phones ring and callers can converse as usual. Only they're doing it on the Internet, not with AT&T's or MCI's meter running.

So that's the current state of the art. The three approaches -- software only, DSP cards and standalone devices -- have drawbacks, but I lean toward the PhoneJACK with Net2Phone or Internet Phone as the best solution for my purposes at this point. All hardware IP Telephony products have one thing in common, however. They're pricey, from about $200 to $300, compared to standard phone instruments that now go for as low as $20. How many long-distance calls will it take to amortize the cost of a Net phone, especially if you have to supply the devices to some of the people you call regularly?

The lack of interoperability looms as an immediate threat to IP Telephony. It reminds me of the bad old days (late 1970s, early 1980s) of proprietary operating systems, including CP/M and DOS. Microcomputers could not talk to each other any more than an InfoTalk can to an Aplio/Phone. It wasn't until standardized operating systems came along that micros began selling in respectable quantities.

I doubt that lack of standards will continue too long, however. Some corporations already use their WANs (Wide Area Networks) for communications via TCP/IP, using the new Voice Over Internet Protocol (VOIP). The audio quality has been likened to that of cell phones, which is good enough for this purpose. And the savings in this context can be significant.

We also have the H.323 standard, which defines a common set of compression/decompression algorithms. Pushed by such biggies as Intel and Microsoft, H.323 is gradually being accepted by IP Telephony vendors. Its champions say it will do for Internet telephony what SMTP (Simple Mail Transfer Protocol) has done for e-mail.

On the debit side is the full-court press by the giant telcos to stifle development of Internet telephony, considering the big political guns they can bring to the task. They claim that if Net phone calls were subject to the same fees as they are, there would be little or no savings.

That remains to be seen. It might be true for large companies with enough telephony volume to get rates of a few cents per minute from the telcos, but probably not for individual and small businesses.

Summing up, most experts believe that Internet telephony future looks promising. I predict many of us will be making at least some of our phone calls over the Net within two to three years.

Ken

Copyright 1998 by Ken Fermoyle, Fermoyle Publications.

Ken Fermoyle has written some 2,500 articles for publications ranging from Playboy, PC World and Popular Science to MacWeek & Microtimes. He was cohost/producer of a radio show on computers and a partner in a DTP service bureau during the '80s. Ken's Korner articles are available free to User Group newsletters and Websites. For permission to reprint this article, contact kfermoyle@earthlink.net.


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