A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Transport Area Working Group Working Group of the IETF.
Title : Implementing an Emergency Telecommunications
Service for Real Time Services in the Internet
Protocol Suite
Author(s) : F. Baker, J. Polk
Filename : draft-ietf-tsvwg-mlpp-that-works-02.txt
Pages : 47
Date : 2005-8-23
RFCs 3689 and 3690 detail requirements for an Emergency
Telecommunications Service (ETS), of which an Internet Emergency
Preference Service (IEPS) would be a part. Some of these types of
services require call preemption; others call for call queuing or
other mechanisms. The key requirement is to guarantee an elevated
probability of call completion to an authorized user in time of
crisis.
IEPS requires a Call Admission Control procedure and a Per Hop
Behavior for the data which meet the needs of this architecture.
Such a CAC procedure and PHB is appropriate to any service that might
use H.323 or SIP to set up real time sessions. These obviously
include but are not limited to Voice and Video applications, although
at this writing the community is mostly thinking about Voice on IP
and many of the examples in the document are taken from that
environment.
In a network where a call that is permitted initially and is not
denied or rejected at a later time, call and capacity admission
procedures performed only at the time of call setup may be
sufficient. However in a network where sessions status can be
reviewed by the network and preempted or denied due to changes in
routing (when the new routes lack capacity to carry calls switched to
them) or changes in offered load (where higher precedence calls
supersede existing calls), maintaining a continuing model of the
status of the various calls is required.
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