As a rule I stay well clear of the bleeding edge of technology.
How odd then, to find myself with a home-grown phone system ”in the cloud”, stitched together with lashings of free and experimental Internet telephony services.
I guess it came about because I need to do business from wherever in the world I happen to be at the time. When I’m away from base the sky-high roaming charges from mainstream telcos become very noticeable, as does the bustle at the local internet café. On the yachting circuit it’s mostly boat crews wanting to keep in touch on email and Skype, and local business seems more than willing to put in free Wi-Fi to attract them.
So after running up a few scary phone bills I started experimenting. Despite its popularity Skype was never the answer as it means being locked into a single provider. There is, however, a fiercely competitive and innovative industry offering Voice over Internet Protocol (VoIP) solutions based on SIP and related internet standards. Not for the fainthearted as there is plenty of churn and more than a few interoperability problems. The bad news for the established telcos is you can build something today and never pay for anything other than your internet connection again.
And it’s not expensive. If you have broadband internet already, an additional outlay of around £25 ($40 / €30) will buy an adapter to SIP-enable your existing fixed line phone. Beyond that, pretty much everything can be had at zero cost with the exception of calls to standard phones. Your mobile phone may be SIP-ready out of the box – SIP is part of the 3GPP standards. If it also has Wi-Fi you may be able to use your mobile to make free calls from any Wi-Fi hotspot. VoIP calling over mobile data is the battleground as network operators would obviously prefer to make lucrative per minute charges for voice calls as long as possible. So your tariff may prohibit those calls and they may even be blocked.
I splashed out on a pair of new Siemens Gigaset IP phones and use my existing Nokia mobile. Both required a fair bit of tinkering to set up but worked well enough after that. You can probably shop around for the best rates to call standard phones forever – there are literally hundreds of internet telephone service providers (ITSPs). None of them are likely to beat good value fixed line providers for local calls unless you can dispense with your land line altogether and cut out the line rental. If you get broadband from your cable provider you may be able to do this. It’s very likely you’ll save on international calls regardless of your broadband provider. However, the better plan is to get more people you call onto SIP. Most ITSPs would have you believe all your internet calls have to go through them and only calls between their customers are free but that is not the case. The core ITSP service is the gateway out to the conventional telephone network and all you really need to make free calls over the internet is SIP at both ends. If your ITSP blocks “peered” SIP calls with unaffiliated networks, as some do, switch.
There are plenty of VoIP and SIP resources out there providing a useful service, more often than not completely free of charge. Here is the handful that are essential to my setup:
SIP Sorcery is a free service providing most of the functionality of a PBX or SIP switch. It went through an experimental cloud computing phase when its uptime wasn’t great but it now seems stable. It lets you set up a switching fabric to connect any SIP account to any phone. You’ll probably need to do some Ruby programming to make it work but there is an active and supportive community – not to mention Aaron, the man behind it – to help with that.
| e164.org |
E164.org is another volunteer-run service which is giving the official public ENUM solution a run for its money. ENUM is a scheme to layer phone number-style addressing over the internet. A key enabler to make internet telephony mainstream, this is another battleground for the telcos, and the standards-track process has been slow. In the UK the official ENUM registry has recently started but in many parts of the world it’s still nowhere. Meanwhile, e164.org has for years cheerfully allowed anyone who controls a phone number to register it and point it at their SIP phone, for free. And nothing prevents anyone setting up their phone to look up internet end-points in e164.org as well as in the official registry. The support is patchy at best but this is a great resource, and funded by donations. Need I say more?
In the UK, to receive calls from those on the plain old telephone system, it’s hard to beat Numbergroup.com. A commercial service making money from termination charges, they are by far the best deal around. The numbers are free, and the margin they take on the calls is razor-thin. Support is really responsive, though they’ve taken some time rolling out new IP-based infrastructure.
Conversely, to let the internet telephony crowd reach you, iptel.org is just the ticket. Free service that acts as a live test bed for well-respected SIP server software SER and SERWeb, not only can it give you a @iptel.org SIP address, you can also set it up to provide SIP service on your own domain, though this requires a little DNS magic. If you would like matching email and SIP telephony addresses on your own domain, iptel.org is your friend.
Finally, Voxalot is a freemium service with a basic free package that includes voice mail and an iNum phone number. The iNum initiative is the one attempt at a VoIP-based global area code that seems to have some traction, to the point where several networks including BT in the UK enable direct calls to these numbers.
Well, there you go. It’s a whole lot more complicated than ideally it should be, but so far it works and is extremely cost-effective. The next step is to deploy all this infrastructure within the business which will be a big test. And then there is a raft of bells and whistles left to implement, such as phone numbers that follow me around the world at a reasonable cost – which is what started the whole thing off after all.
And if you have experience of deploying VoIP in a small business or even if you’re just at the thinking stage, I’d love to hear from you.
No, really, I would…


