Where would you install a Windows Phone notification server? On a super node? Nope, most calls are direct, remember? What about a server at Skype headquarters? Won’t do any good there either. There wasn't a Skype server in the middle of that transaction, just two users waving each other down and having a chat. Remember when we called John Doe in an earlier example? That call was direct Skype client to Skype client. But that’s where notifications swoop in and save the day, right? That means that the application couldn’t possibly run in the background let alone receive calls from other users. However, none of these agents support running for an indefinite amount of time or have the ability to maintain persistent network connections. You probably know by now that Windows Phone 7.5 “Mango” ushered in support for fast application switching (multitasking) and background agents, little bits of code that can be programmed to run in the background. In other rare cases, Skype may use an intermediate node, e.g. In most cases, direct communication is possible and utilized.
It’s important to note here that call routing isn’t performed through Skype servers at all. In this figure, a Skype user – you – is initiating a direct connection with John Doe he receives the call and you both chat for 12 hours about favorite cookie recipes. The important take away here is that your local super node helped you find John and passed on all the details needed (e.g. Generally speaking, the software found John’s details via a complex traversal of the Skype P2P network. Let’s move on to how a Skype call is made.įirst, for the sake of brevity, let’s assume that you already added John Doe to your Skype client’s contact list. In this case, super nodes don’t handle login requests for obvious security reasons. The line connecting us to Skype’s login servers is present to demonstrate that some data aren’t sent through local super nodes. We’re connected to a super node with lots of CPU power and bandwidth. In the figure above, Skype users - you and I - are represented by the smaller circles. Here’s how a piece of that network would look visualized with cute circles and lines:
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