AT&T uses IBM WebSphere SIP

Erik Burckart, former co-worker and all around cool guy, pointed out that it's finally public that AT&T uses WebSphere SIP and followed it up with some screaming SIP performance numbers.

I spent better than a year working on an earlier incarnation of WebSphere SIP, and it's very nice to see it succeed both technically and in the marketplace. From the press release, it is also fun seeing IBM build SIP-related capabilities into Tivoli and Rational products in addition to WebSphere.