||: List of VoIP Standards Considerations :||
Evan,
My previous reply to your questions concerning VoIP QoS-related issues and call set-up procedures was not only overly simplistic, but in an effort to be concise I overlooked many of the parameters, and even some of the more prominent points associated with the new model.
By viewing the url below you will get a fuller sense of the issues that were cited earlier on as the key elements needed to incorporate into the new architecture. It's a document included in the European Telecommunications Standards Institute (ETSI) TIPHON Project proceedings on the study of VoIP standards issues.
Of particular interest to some may be the cast of characters that makes up this cadre of the undertaking, and the inclusion early on of ISDN and GSM Cellular in the blueprint. From the document, it is intended to:
"...establish the state of the art concerning voice interworking between terminals over IP based networks and PSTN/ISDN/GSM terminals, to understand the issues involved and the experience required and to prepare a proposal for further work."
Below, I've included some of the more salient points that may illuminate what those issues were, and still are.
Enjoy, and Regards,
Frank Coluccio
=================(Edited for thread)
From:
iihe.ac.be
It was made a condition that the project will concentrate on the following terms:
ú interoperability between PSTN, N-ISDN, GSM and IP-based networks,
ú the ETSI members will be informed on a wide basis about the progress of the project,
ú to avoid overlap with other ETSI groups,
ú to make subcontracts if necessary only,
ú Internet-specific work concerning TCP and IP protocols is belonging to the IETF and is no part of the TIPHON project.
The scope of the project focuses on voice communication and the project is divided into three phases:
1. Deliverables required for ensuring voice communication from an IP based network voice user to voice users in PSTN/ISDN/GSM.
2. Deliverables required for ensuring voice communication from users in PSTN/ISDN/GSM to voice users in IP based networks.
3. Deliverables required for ensuring voice communication between users of PSTN/ISDN/GSM using IP based networks for the connection/trunking between the involved PSTN/ISDN/GSM
Two "guardian angels", Mr Phil Davidson (BT) and Mr Dieter Kaiser (Siemens) were appointed by the ETSI Board, in order to observe the adherence to these terms.
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Introduction : The first real TIPHON meeting took place, during three days in Sophia Antipolis, on 20-22 May 1997. This meeting was attended by 48 participants from 13 countries including the United States. Delegates from ITU-T SG 16 (John Magill, Lucent Technologies) and the IMTC VoIP Forum (Scott Petrack, VocalTec) attended the meeting. At least five attendees were regular IETF meetings participants. Many North-American companies were represented (Lucent Technologies, 3Com, Cisco, Motorola, AT&T, Digital, Nortel, Unisys,...).
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Contributions :
On the second day, six contributions were presented and discussed. These contributions were proposed by Lucent Technologies (TD 15), Ericsson (TD 23), Nokia (TD 14), 3Com (TD 17), VocalTec (TD 18) and Lucent Technologies (TD 19).
ú TD 15 proposed requirements for Internet Telephony Naming and presented an overview of some naming systems.
ú TD23 discussed some basic mechanisms to ensure IP based Networks and PSTN/ISDN/GSM service interoperability.
ú TD14 presented a routing protocol approach for address mapping for IP voice/ISDN interworking.
ú TD17 proposed to use a combination of RSVP, IEEE 801.1p and IEEE 801.1q in order to support Quality of Service (QOS) in LAN and IP environments.
ú TD18 stated several topics in the area of addressing, numbering and multimedia Intelligent Network (IN) services. It suggested the creation of an IN/IP working group.
ú TD19 presented a report about the PINT BOF held at the last IETF meeting. PINT deals with signaling features like click-to-dial, click-to-fax and click-to-fax-back. The purpose of PINT is not to deal with voice over IP and no gateway issues are covered by this project. In our opinion, it can be viewed as a transition phase between the use of two separated voice and IP networks and the use of an integrated voice over IP network. It was agreed at the meeting that no gateway discussion will be initiated in the IETF by TIPHON members.
Working groups :
Following these presentations, a discussion occurred on the project work items and the creation of working groups. It is of prime importance to note that a consensus seems to be established to consider only ITU-T H.323 terminals as the base for all further work in the TIPHON project. It doesn't seem, at this time, that other terminal types will be considered, i.e. architectures defined by other standardization bodies such as DAVIC, MMCF or even the IETF. In particular, the architecture being defined by the IETF (based on RTP but using its own draft-signaling) is not considered at all. Moreover, it should be observed that interworking between multimedia terminals is outside the scope of this ETSI project. On the contrary, the interworking between IETF and ITU multimedia terminals is being studied at the IETF.
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1. Requirements for service interoperability, technical aspects of charging/billing and security (chair: Mohammad Mahloujian, Ericsson).
2. Architecture and reference configurations (chair: Jozef Vandenameele, Alcatel).
3. Call control procedures, information flows and protocols (chair: Scott Petrack, VocalTec).
4. Naming, numbering and addressing (chair: Louise Spergel, Lucent Technologies).
5. End-to-end quality of service aspects (chair: Barrymore Castle, 3Com).
6. Verification and Demonstration Implementation (interim chair: Michael Blaschitz, Infonova).
ú Web site : etsi.fr |
