British Telecom Claims Patents on VOIP Session Initiation Protocol

Posted by Unknown on Wednesday May 1, 2013 @02:36AM from the assuredly-not-bogus dept.

An anonymous reader writes with bad news for operators of SIP gateways. From the article: "VoIP-to-PSTN termination providers and SIP vendors will be watching their inboxes for a lawyer's letter from BT, which has kicked off a licensing program levying a fee on the industry, based on a list of 99 patents .. The British incumbent is offering to allow third parties to use the Session Initiation Protocol under a license agreement... BT is requesting either $US50,000 or a combination of 0.3 percent of future revenue from affected products, plus 0.3 percent of the last six months' sales for products as 'past damages.' It's kindly offering a discount for customers that pay up within six weeks of receiving a BT letter of demand, and there's a premium to $US60,000 and 0.36 percent of revenue for those who hold out."

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Prior Art: MMUSIC by anwaya · 2013-05-01 05:03 · Score: 5, Informative

The IETF MMUSIC (Multiparty Multimedia Session Control) Working Group started working on Session Protocols in 1993.

Initial Internet drafts for a Session Invitation Protocol and a Simple Conference Invitation Protocol were prepared in 1996, and merged to a single first draft of SIP by December 1996 (slide 10), with further drafts (2-12) leading up to the publication of RFC 2543 in March of 1999 (slides 11-13, ibid.).

I don't see anything that says BT had a hand in anything to do with SIP up to 1996. More than half the patents BT claims (Exhibit C) were filed after RFC 2543 was published.

I hope this information is a useful starting point for some SIP vendor.