This I already know. You don't need to convince me on the benefits of using :) I don't use much Skype, I have a SIP enabled phone at home. I just hope that an openmoko-like phone can fulfill my needs of an open phone.
But the initial discussion on this thread was:
> but no global database of all cellular users is needed.
to which I responded that the problem was the same today with SIP.
Can we agree on the 2 following sentences:
* the fact that Skype is a lock-in solution and doesn't interop with other VoIP solutions
* SIP also requires some sort of "global database" for each particular service provider, thus forcing you to login to a registrar to make use of *your* SIP id, meaning that if you registrar is down, you cannot be reached (but can make calls by reconfiguring your phone to use a different service provider)
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