Nortel MAS, Справочное руководство

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32 Introduction
Figure 1
Media Application Server in the MCS 5100 network
MCS Ringback and Treatment Service
The Multimedia Communication Server (MCS), because of the Session
Initiation Protocol (SIP) maturity of a connected endpoint, can perform call
transfer services on behalf of that endpoint. Current restrictions are as
follows:
• The endpoint being transferred (the transfer target) hears dead air
(silence) for the duration of the transfer until the transfer-to party
answers.
• The endpoint being transferred (the transfer target) receives no audible
indication of the reason for a failure of the transfer-to leg; instead, as the
initial leg of the call is answered, a simple BYE is sent.
To address these restrictions, the MCS ringback and treatment service
provides the ability for a network-based audible ringback or network-based
treatment to an endpoint for which the MCS is handling a call transfer (SIP
REFER), or alternatively, an indication of a call failure to the same endpoint.
Ringback and treatment service functionality overview
The ringback and treatment service provides the following functionality:
• detection of a media pivot transfer scenario
Nortel Media Application Server
Media Application Server Planning and Engineering
NN42020-201 01.04 Standard
4.0 27 July 2007
Copyright © 2007, Nortel Networks
.