David has summarized a talk given by Henry Sinnreich in the recent VON meeting. Sinnerich said to the effect that “People say they have VoIP, but if you can't give me a SIP URI, then you don't have VoIP. You have a contraption of some kind, but it is not VoIP, as far as I'm concerned." I do not cheer this remark. Let me explain.
As I have said it before, the only real benefit of VoIP is that users can use one or more service providers concurrently; or they may not use any service providers at all. Any implementation that stifles this freedom is not to be encouraged. Use of SIP URI does not guarantee this freedom; use of another URI, like h323 does not curtail it. Windows messenger requires you to register to a proxy, violating the basic expectation. On the other hand, NetMeeting, using H.323 allowed direct communication. Equating SIP to the basic value of VoIP is a bit categorical.
Posted by aswath at April 5, 2004 07:18 PM
how can I config a SIP URI server
Posted by: shakhawat at June 8, 2004 08:06 AM