The Jeff Pulver Blog: Talking VoIP: SIP URI's as HD Callsign

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May 13, 2009

Talking VoIP: SIP URI's as HD Callsign

The world of telephone numbers remains stuck in standard definition mode, so I have started to assemble a directory of SIP URI's to connect people that have HD enabled IP Phones. The prospect of reaching several billion end points and the ubiquitous 12 digit keypad has meant almost no use of SIP URI addressing (name@domain.com). However, URI's represent the only option for connecting HD devices and offer the added benefit of unmetered termination to any Internet connected endpoint.

Readers of this blog know my passion for communication technology started with ham radio at an early age. The ham radio callsign provided an identity and means to have conversations with people around the world. I believe the HD usage can spread in the same way using SIP URI's as callsign and identity. Navigating by URI's remains awkward at the moment, but it can be done through web based mechanisms. My Polycom Soundpoint IP 550 supports SIP URI's as entries in the address book. Increased adoption of SIP URI's should quickly yield web based apps and accommodations by device manufacturers.

The continued domination of telephone numbers represents a significant drag on communication nirvana. The world wide web would never have become the world wide web if website navigation meant dialing IP addresses. The headache of finding and managing telephone numbers does no exist to the same degree in the case of email and web addresses given their more human friendly form. Unlike in the case of telephone numbers, one can even usually guess Internet addresses.

Telephone numbers were introduced as a means to eliminate telephone operators, not for the benefit of end users. Telephone numbers have long outlasted whatever technological constraints led to their creation. The HD SIP URI directory I have in mind is not a listing of people and their respective HD SIP URI. I am looking to assemble a list of domains that support HD end points and a description of the URI construction rules for the domain. I want document how to reach each of the HD end points at ibm.com, hp.com, etc. As with email, there exist a relatively small number of ways to construct a SIP URI - jpulver@pulver.com, jeff@pulver.com, jeff.pulver@pulver.com, etc.

The directory can also list nick names, but I am particularly interested in using SIP URI's as the catalyst to interconnect the millions of already deployed HD end points among Fortune 500 companies. As in the early days of email, people need to push their
IT departments to provide SIP URI's as an option for connecting their HD capable Polycom, Snom, or AudioCodes IP phones. Figure out your SIP URI and send it along. Your SIP URI callsign represents the key to accessing the world of HD communication.

Please tune into the Audiocodes sponsored webinar scheduled for tomorrow (May 14th) at 11:00 AM ET where I will be discussing SIP URI's and other HD topics together with Alan Percy of AudioCodes.

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Posted by: nana at August 3, 2009 03:30 AM

Hi Jeff,

I agree 100% with you that interconnection between the different telecom and voip operators is the next challenge. I haven't seen you commenting on our latest service, Manisky: http://www.manifone.com/mani-sky.php?lang=en

It allows calling Skype users from any fixed or mobile phone. We are heavily working on achieving the same with all the other big voip networks.

If you want to discuss our approach, please feel free to get in touch with me.

Posted by: Lounis at May 21, 2009 09:18 AM

May 13, 2009

Talking VoIP: SIP URI's as HD Callsign

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