1. Scope

   The International Telecommunications Union Standardization Sector
   (ITU-T) has created the H.350 series of Recommendations that specify
   directory services architectures in support of multimedia
   conferencing protocols.  The goal of the architecture is to
   'directory enable' multimedia conferencing so that these services can
   leverage existing identity management and enterprise directories.  A
   particular goal is to enable an enterprise or service provider to
   maintain a canonical source of users and their multimedia
   conferencing systems, so that multiple call servers from multiple
   vendors, supporting multiple protocols, can all access the same data
   store.

   H.350 architectures are not intended to change the operation of
   multimedia conferencing protocols in any way.  Rather, they are meant
   to standardize the way the already defined protocol elements are
   stored in a directory, so that they can be accessed in a standardized
   manner.

   In the H.350 series, Recommendation H.350 specifies the base
   architecture and object classes, while subordinate Recommendations
   specify elements that are specific to individual protocols.
   Currently, the Recommendations include:

   H.350   - Directory Services Architecture for Multimedia Conferencing
   H.350.1 - Directory Services Architecture for H.323
   H.350.2 - Directory Services Architecture for H.235
   H.350.3 - Directory Services Architecture for H.320
   H.350.4 - Directory Services Architecture for SIP
   H.350.5 - Directory Services Architecture for Non-Standard Protocols

   Because SIP is an IETF standard, the contents of H.350 and H.350.4
   are made available via this document to the IETF community.