B.2 IG0601 Comment to modemType changed to allow multiple
instances of extensionParameter.
B.2 GEN0202 Comment added to indicate units for Timer.
B.2 IG1100 Added parentheses to digitMapRange production.
B.2 IG1100 Added comment to serviceChangeParm,
restricting each parameter to one appearance.
B.2 IG0601 Added comments making serviceChangeMgcId and
serviceChangeAddress mutually exclusive in
ServiceChangeParm and servChgReplyParm.
B.2 IGDUB Added comment to serviceChangeParm indicating
that ServiceChangeMethod and
ServiceChangeReason are required.
B.2 IG0601 Added Timestamp to servChgReplyParm.
B.2 IG0601 Added comment indicating coding of Value for
ServiceChangeReason.
B.2 IG0601 Modified ServiceChangeAddress to use MId
definition for full address.
B.2 IG1100 Made returned value optional in
statisticsParameter, to support
auditCapability result.
B.2 IG1100 Changed topologyDescriptor to allow multiple
triples.
B.2 IG0601 Added comment forbidding use of a double quote
within a quotedString value.
B.2 IG1100 Reserved prefixes for new tokens added to
signalParameter and eventParameter, to avoid
collision with package names.
B.2 IG1100 EmbedToken and EmergencyToken changed to
remove clash with EventBufferToken.
B.3 IG1100 New section describing hexadecimal octet
encoding.
B.4 IG1100 New section describing hex octet sequence.
C IG1100 Added permission to use Annex C properties in
LocalControl as well as in Local and Remote.
C IG0601 Added text making support of all properties of
Annex C optional.
C IGDUB Added directions to reconcile tabulated
formats with allowed types for properties.
C.1 IG1100 Corrected Q.765 reference to Q.765.5 for
ACodec.
C.1 IG1100 Deprecated Echocanc codepoint in favour of
package-defined property.
C.4 ITUPOST Updated references from Q.2961 to Q.2961.1.
C.4 IGDUB Added details on format of VPVC.
C.9 IG1100 Renamed USI to layer1prot.
C.9 IG1100 Deprecated ECHOCI codepoint in favour of
package-defined property.
C.9 IG1100 Added new USI property.
C.11 IG1100 Added m= line tag.
D.1 IG0601 Added explanation of ALF.
D.1.5 IGDUB Expanded text indicating that when trying to
reestablish contact with the previously
controlling MGC the MG uses the Disconnected
method.
E.1.2 GEN0202 Added missing EventsDescriptor parameters
lines.
E.1.2 GEN0202 For the Signal Completion event:
- corrected the description of how it is
enabled
- heavily edited the description of the Signal
Identity observed event parameter and added a
type.
E.1.2 IGDUB The timeout completion reason for the Signal
Completion event was broadened to include
other circumstances where the signal completed
on its own.
E.1.2 IG1100 Added signal list ID observed event parameter
to the Signal Completion event.
E.2.1 IG0601 Added missing read only, read-write
specifications.
E.2.1 IG0601 Split ProvisionalResponseTimer properties into
one for MG, one for MGC.
E.3 GEN0202 Added "Designed to be extended only" to
tonegen package description.
E.4 GEN0202 Added "Designed to be extended only" to
tonedet package description.
E.4.2 GEN0202 Added type for tone ID observed parameter for
Long Tone Detected event.
E.6.2 IG1100 Corrected binary identifier for digit map
completion event to avoid clash with base
package.
E.6.2 IG1100 Removed procedural text.
E.6.5 IG1100 Added procedural text indicating where to find
the applicable digit map and indicating the
error to return if the parameter is missing.
E.6.5 IG0601 Further modified procedural text.
E.7.3 IG1100 Corrected text identifier for payphone
recognition tone to avoid clash with base
package.
E.10.5 IGDUB Provided informative references for tones and
procedures for continuity check.
E.13 GEN0202 Added note that TDM package could also apply
to other transports.
E.13.1 IG1100 Changed default for echo cancellation from
"on" to provisioned.
E.13.1 IG0601 Corrected type for gain property.
Appendix TTPOST Included a number of corrections which were
I not picked up in H.248.1 Amendment 1 but which
do appear in H.248.1 v2.
Intellectual Property Rights
The ITU draws attention to the possibility that the practice or
implementation of this RFCmay involve the use of a claimed
Intellectual Property Right. The ITU takes no position concerning
the evidence, validity or applicability of claimed Intellectual
Property Rights, whether asserted by ITU members or others outside of
the Recommendation development process.
As of the date of approval of this RFC, the ITU had received notice
of intellectual property, protected by patents, which may be required
to implement this RFC. However, implementors are cautioned that this
may not represent the latest information and are therefore strongly
urged to consult the TSB patent database.
The IETF has also received notice of intellectual property claims
relating to Megaco/H.248.1. Please consult the IETF IPR
announcements at http://www.ietf.org/ipr.html.
Acknowledgments
Megaco/H.248.1 is the result of hard work by many people in both the
IETF and in ITU-T Study Group 16. This section records those who
played a prominent role in ITU-T meetings, on the Megaco list, or
both.
Megaco/H.248 owes a large initial debt to the MGCP protocol (RFC
2705), and thus to its authors, Mauricio Arango, Andrew Dugan, Ike
Elliott, Christian Huitema, and Scott Pickett. Flemming Andreasen
does not appear on this list of authors, but was a major contributor
to the development of both MGCP and Megaco/H.248.1. RFC3435 has an
extensive acknowledgement of many other people who worked on media
gateway control before Megaco got started.
The authors of the first Megaco RFCs (2805, then 3015) were Fernando
Cuervo, Nancy Greene, Abdallah Rayhan, Christian Huitema, Brian
Rosen, and John Segers. Christian Groves conceived and was editor of
Annex C. The people most active on the Megaco list in the period
leading up to the completion of RFC2885 were Brian Rosen, Tom
Taylor, Nancy Greene, Christian Huitema, Matt Holdrege, Chip Sharp,
John Segers, Michael Thomas, Henry Sinnreich, and Paul Sijben. The
people who sacrificed sleep and meals to complete the massive amount
of work required in the decisive Study Group 16 meeting of February,
2000, were Michael Brown, Ranga Dendi, Larry Forni, Glen Freundlich,
Christian Groves, Alf Heidemark, Steve Magnell, Selvam Rengasami,
Rich Rubin, Klaus Sambor, John Segers, Chip Sharp, Tom Taylor, and
Stephen Terrill.
The most active people on the Megaco list in the period since the
February 2000 have been Tom Taylor, Brian Rosen, Christian Groves,
Madhu Babu Brahmanapally, Troy Cauble, Terry Anderson, Chuong Nguyen,
and Kevin Boyle, but many other people have been regular
contributors. Brian Rosen did tremendous service in putting together
the Megaco interoperability tests. On the Study Group 16 side, the
editorial team for the final revised document in February, 2002
included Christian Groves, Marcello Pantaleo, Terry Anderson, Peter
Leis, Kevin Boyle, and Tom Taylor.
Tom Taylor as Megaco Chair managed the day to day operation of the
Megaco list, with Brian Rosen taking an equal share of the burden for
most of the last three years. Glen Freundlich as the Study Group 16
Rapporteur ran the ITU-T meetings and ensured that all of the work at
hand was completed. Without Glen's determination the Megaco/H.248
standard would have taken at least half a year longer to produce.
Christian Groves filled in ably as Rapporteur when Glen could no
longer take part.
Authors' Addresses
Terry L. Anderson
24 Hill St
Bernardsville, NJ 07924
USA
EMail: tlatla@verizon.net
Christian Groves
Ericsson AsiaPacificLab Australia
37/360 Elizabeth St
Melbourne, Victoria 3000
Australia
EMail: Christian.Groves@ericsson.com.au
Marcello Pantaleo
Ericsson Eurolab Deuschland
Ericsson Allee 1
52134 Herzogenrath, Germany
EMail: Marcello.Pantaleo@eed.ericsson.se
Tom Taylor
Nortel Networks
1852 Lorraine Ave,
Ottawa, Ontario
Canada K1H 6Z8
Phone: +1 613 736 0961
EMail: taylor@nortelnetworks.com
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