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The History of VoIP (Full Version)

The History of VoIP Voice over Internet Protocol, abbreviated VoIP, is a fairly recent technology. It goes by many names, including Voice Over Broadband (VoBB), Internet Telephony, IP Telephony, and broadband phone.The advent of the Internet brought with it an abundance of innovation regarding communication. Of course, there was email in the beginning, but then people started wondering whether th...
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What is SIP ALG and why do we recommend that I turn it off?

When discussing VoIP problems with our support team we may ask you whether SIP ALG is enabled on your router. This article intends to explain what it is, how it can affect VoIP and why we recommend you turn it off. What is SIP ALG? SIP ALG stands for Application Layer Gateway, and is common in many commercial routers. It intends to prevent some of the problems caused by router firewalls by inspe...
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Problems with TAP SMS over PSTN

Problem: Having only just realized that the O2 sms gateway is not reliable [when I first realised I should have had alerts, I thought my SD2 dialler had died], I have contacted O2 who are looking into the service, and they maintain that it should be running at the time of writing [November 2011] but advise me that it will cease operation around April 2012. I have discovered a long list of TAP ...
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