New ID draft-hunt-sigtran-iua-rate-message-00

All

The new ID draft-hunt-sigtran-iua-rate-message-00 has recently been
submitted, with title "IUA Extension for Rate Control Message". The
abstract is:

"This document describes a new message, its associated acknowledgement
message, and a new parameter to extend the ISDN Q.921-User Adaptation
(IUA) protocol (RFC4233).  The protocol extension is to support the use
of an Overload Control Agent in a Signaling Gateway (SG).  The Overload
Control Agent is able to restrict the admission of new originating ISDN
calls (sessions) messages from the ISDN End Point to each Application
Server Process (ASP).  Both messages defined here contain a single
mandatory parameter, the Call (Session) Admission Rate.  An ASP is able
to use this protocol extension to control the rate of new calls admitted
towards that ASP by the Overload Control Agent.

"The new message and its acknowledgement message are added to the
Application Server Process Traffic Maintenance (ASPTM) message class.

"As the DPNSS1/DASS2 Extension to IUA (DUA, RFC4129) also uses the ASPTM
message class, the IUA protocol extension described in this document
also applies to DUA.

"For backward compatibility, a Signaling Gateway which does not support
the new message is expected to follow standard IUA behaviour by
discarding the message, and returning an error code of "Unsupported
Message Type" to the sender."

We hope to progress this as an individual draft, with review from the
sigtran community. Review and comments will be much appreciated.

Geoff Hunt 
BT Design

Tel: 01473 608325
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