Session Initiation Protocol (SIP) User Agent (UA) MIB module.

SIP is an application-layer signaling protocol for creating,
modifying, and terminating multimedia sessions with one or more
participants.  These sessions include Internet multimedia
conferences and Internet telephone calls.  SIP is defined in
RFC 3261 (June 2002).

A User Agent is an application that contains both a User Agent
Client (UAC) and a User Agent Server (UAS).  A UAC is an
application that initiates a SIP request.  A UAS is an
application that contacts the user when a SIP request is
received and that returns a response on behalf of the user.
The response accepts, rejects, or redirects the request.

Copyright (C) The IETF Trust (2007).  This version of
this MIB module is part of RFC 4780; see the RFC itself for
full legal notices.