A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Requesting Answering and Alerting Modes for the Session Initiation Protocol (SIP)
Author(s) : D. Willis, A. Allen
Filename : draft-willis-sip-answeralert-01.txt
Pages : 28
Date : 2005-8-31
This document defines three SIP extension header fields and
associated option tags that can be used in INVITE requests to convey
the requester's preference for user-interface handling of that
request. The first header, "Answer-Mode", expresses a preference as
to whether the target node's user interface waits for user input
before accepting the request or instead accepts the request without
waiting on user input. The second header, "Priv-Answer-Mode" is
similar to the second, except that it requests administrative-level
access and has consequent additional authentication and authorization
requirements. The third header, "Alert-Mode", expresses a preference
as to whether the target node's user interface alerts the user about
the request. These behaviors have applicability to applications such
as Push-to-Talk and to diagnostics like loop-back. This document
also defines use of the SIP extension header field "Answer-Mode" in a
response to an INVITE request to inform the requester as to which
answer mode was actually applied to this request. There are
significant security considerations, especially when an answering
mode option is used in conjunction with an alerting mode option.
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