In my previous post, I discussed the problems firewalls and NATs have with VoIP communications, and I touched briefly on the ways to get around them. I will go into more details in this post. I will treat NATs and firewalls as mostly the same thing, and use one term or another as convenient. Although there are problems associated specifically with one or the other, the general solutions are similar. The proposed solutions are very different from each other both
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By Ran Arad | August 13th, 2008 | Filed under Standardization
The answer to this question is obvious: VoIP is an element of Communication, and firewalls and network address translators (NATs) are elements of Separation (NAT tends towards Obfuscation, but it amounts to the same thing). These are opposing forces: Separation constricts Communication and Communication pierces Separation. It’s like yin and yang, day and night, law and chaos. Can a leopard change his spots? Can a firewall be welcoming? Oh, you mean at the technical level? Right. None shall pass There’s
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By Ran Arad | August 6th, 2008 | Filed under Interoperability, Standardization
Checking the searches that lead people to this blog revealed that they search for “Radvision INOUT”. Thus, on public demand, I will explain the super-secret-non-more-secret parameter guidelines. From RADVISION’s common type definitions: /* Some "empty" definitions that we can use for readability of the code */ #define IN #define OUT #define INOUT What this simply means is these words are replaced by nothing; they are just indications for the reader, not the compiler. I think mini-comments may be the best
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By Ran Arad | May 8th, 2008 | Filed under SDKs
In my previous post, I mentioned the “wicked son,” the vendors who want to give their customers a sense of security, but do not actually want to implement any cumbersome security algorithms. I had a customer using H.323 who sent me specifications for a security implementation for H.323 where the password wasn’t known in advance, and asked us to support it. When I mentioned to them that they were showing the password in the open, where anyone who wants can
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By Ran Arad | April 30th, 2008 | Filed under SDKs, Standardization
