FYI

-----Original Message----- From: Tyler Miller Johnson [mailto:trjohns1@email.unc.edu] Sent: Wednesday, February 19, 2003 11:37 AM To: h323forum Subject: [h323forum] Presence in LDAP

Dear H323Forum User,

I have been following the recent discussions about presence and instant messaging in H.323. I am the editor of a proposed new series of recommendations from ITU-T Study Group 16 on directory services architectures for multimedia conferencing. The architecture has been under review in SG16 for sometime, and we are hoping for ratification in May of this year if all goes well.

The architecture is LDAP based and provides a way for users to be listed in directories in a standardized way, allowing searching of enterprise directories, and even searching of directory portals which can find users across the Internet. The architecture also supports the management of users through LDAP, rather than through closed databases associated with gatekeepers or SIP proxies.

Early on it became evident that we could easily support presence through this architecture through the addition of a simple attribute. However, we chose not to add that because there already seemed to be confusion in the presence space with competing protocols. We did not want to cloud the issue.

In some ways, the LDAP approach to presence is perhaps more scalable as it addresses security and large scale federation (i.e. inter-institutional) dynamics more directly.

My question is, should SG16 re-visit this issue in regards to LDAP, or leave it out as it currently stands?

Regards, Tyler Johnson Editor, H.LDAP

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