and is that what the N900 use? because on the N810 skype was the only application that worked with proxy. Infact ask any sysad there would tell you skype is notorious for getting round firewalls that is why its hugely popular and why it just works. I dont know much about telepathy-spirit but I know that Telepathy (and any of its non skype plugin just doesnt work with proxy)

NB indeed skype on the N900 is based on telepathy-spirit which is closed source btw the underlining protocol is proprietary. I think its just a way to port the skype proprietary protocol to N900. Its just a shame that such closed source protocol is the only component of telepathy that works with and respect the system wide proxy