In this recent post about Sightspeed, phoneboy stressed the fact that Skype has an advantage: it can "sneak" into enterprises.
Sincerely, I don't see the point in "sneaking": like doing things unseen, it conveys an image of "burglars of the net". Wouldn't be a better choice not to "sneak", but to try openly what the netadmins allow you to do?
Our end-to-end platform (abbeyphone VOW) follows successfully this strategy: firstly, try to connect on a standard SIP connection. If it doesn't work, try to build a TCP tunnel over ports 80 and 443. Try to connect via http proxy, by means of WPAD.
Crystal clear, no "tricks", no "sneaking out": it preserves the network environment security, by passing the network hurdles and still giving full access to the abbeyphone services.
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