A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Voiceband Data Transport Services in Megaco/H.248
Networks
Author(s) : A. Schwarz
Filename : draft-schwarz-megaco-relay-services-01.txt
Pages : 21
Date : 2003-5-12
This document describes the terminology and gives a network model for
different strategies concerning Voiceband Data (VBD) transport services.
The purpose of this effort is to set the reference space for describing
and evaluating Megaco/H.248 signaling procedures. Primary scope are
voiceband data services, typically inherent part in voice-over-packet
networks (e.g., like Internet Telephony).
Motivation:
VBD calls typically start out as a voice call. The modems on the VBD
devices at the Termination detect the switch to VBD (like facsimile) and
fax modem or data modem transmission begins. With the development of
Voice over IP, many CODECs have been developed which are optimized for
the transmission and reception of voice. In creating these CODECs, VBD
transport may not reliably be used over the same transmission channel.
In an effort to optimize the transmission of VBD, specialized protocols
(e.g., T.38, or V.150) have been developed to provide a more reliable
transport, minimize bandwidth usage, etc.
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