March 21, 2007

OpenID Negates the Need for P2P SIP

I just now read a post by Alex Mayrhofer where he suggests that OpenID can be used as the identifier in a P2P SIP network, which till now used a centralized id server. Apparently he is going to float this idea in the P2PSIP working group meeting. Since he is coming close to an idea that I had proposed almost 4 years back, I think I am going to make it public: one does not need OpenID to realize the ultimate p2psip (intentional change in the case).

The problem with the proposed P2PSIP is that it requires a critical mass of subscribers and that some of them have to become supernodes to route further traffic. If only two people want to communicate with each other and without requiring any body else’s assistance P2PSIp will not help you: in this respect it is no different than Skype. But P2PSIP and now Alex are missing a simple observation. I can store the IP address and the port number on which my SIP client will listen for incoming calls in a web page and my partner can visit that page before initiating a session request. This simple directory service almost eliminates the need for SIP proxies. Of course the problem is not fully solved because of the pesky NAT/FW traversal. If I am being served by a UPnP enabled router then the SIP client can establish the mapping rule; otherwise the web server can be used as the relaying point without requiring any SIP capabilities at all.

But with OpenID one can achieve something more. The web site can now provide the mapped IP address and port number by taking into account the OpenID of the initiator, just like Relevance Engine from iotum will do. What I mean is that the resultant mapping will be my SIP client for my family members and that of a voice mail server for business contacts, if the request is made on a weekend. I hope that after reading this Dean changes his mind regarding his remark about SIP not requiring the services of OpenID.

I am posting this in a hurry so as to lay a claim to this proposal that I had developed during the summer of 2003. Later on I presented this to my current employer during the interview (to show off my prowess) and have subsequently approached a few angels. Since I was hoping to realize in an implementation I did not make it public. Today my hand is forced to make it public and coincidentally a realized implementation will be available soon enough.

Posted by aswath at 03:52 PM | Comments (3)

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