SIST-TS TS 101 332 V4.1.1:2004

• Abstract:

  MEGACO Package implementing TIPHON reference points T2 and I3. The purpose of this H.248/MEGACO package is to extend the currently available standard packages to allow control of Quality of Service and Media Firewall functions using the H.248/MEGACO protocol. It complements the Release 4 H.248/MEGACO Technology Mapping for Reference Point N.

• Status: Published
• Publication Date: 31-Mar-2004
• ICS: 33.020 - Telecommunications in general
• Technical Committee: SPN - Services and Protocols for Networks
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Apr-2004
• Due Date: 01-Apr-2004
• Completion Date: 01-Apr-2004
• Ref Project: ETSI TS 101 332 V4.1.1 (2002-06) - Telecommunications and Internet Protocol Harmonization Over Networks (TIPHON) Release 4; Interface Protocol Requirements Definition; TIPHON Extended H.248/MEGACO Package (EMP) Specification; ICF Control over Reference Point

SIST-TS TS 101 332 V4.1.1:2004 is the Slovenian standard identical to ETSI TS 101 332 V4.1.1, published by SIST. It specifies a TIPHON Extended H.248/MEGACO Package (EMP) for ICF control over the reference point, used for TIPHON reference points T2 and I3. The package extends H.248/MEGACO so controllers can manage Quality of Service and Media Firewall functions in IP telephony and VoIP networks.

What does SIST-TS TS 101 332 V4.1.1:2004 specify?

SIST-TS TS 101 332 V4.1.1:2004 specifies the EMP for a middlebox acting as an InterConnect Function (ICF). In practice, it tells implementers how to control that function through H.248/MEGACO.

The document is organized into these main parts:

• Clause 1 - Scope
• Clause 2 - References
• Clause 3 - Definition
• Clause 4 - Middlebox Package, with properties, events, signals, statistics, and procedures
• Clause 5 - Formal syntax
• Annex A - Bibliography, informative

Clause 4 is the technical core. It defines the package identity as EMP, gives its version, and describes the control model for the middlebox.

What are the key requirements of SIST-TS TS 101 332 V4.1.1:2004?

Clause 4 defines how the package controls interfaces, traffic handling, and flow behavior. The practical point is that a controller must set the right descriptors and watch the returned statistics if it is managing a middlebox in a live network.

• Interface ID: Clause 4.1 defines iface as a read/write integer in the termination state descriptor. It identifies which logical interface applies to the ephemeral termination, so the controller can direct traffic to the right IP address range.
• Token Rate: Clause 4.1 defines tokenrate as a read/write integer in the termination state descriptor. It limits the sustainable data rate for an ephemeral termination; traffic above the token bucket is silently discarded, so operators can enforce bandwidth limits on untrusted flows.
• Pin-Hole Time To Live: Clause 4.1 defines phttl as a read/write 32-bit integer in the local control descriptor. If it is absent, the pin-hole lasts indefinitely, so this setting controls how long the allowed passage through the middlebox remains open.
• Pin-Hole Timer Expired event: Clause 4.2 defines phtoexp as an event with no parameters. Controllers use it to learn when the pin-hole has timed out and may need to be refreshed or closed.
• Discard statistics: Clause 4.4 defines pd for packets discarded and od for octets discarded, both as unsigned 64-bit counters. These counters let the operator verify whether source, port, or rate checks are dropping traffic.
• Flow setup and filtering: Clause 4.5 says a flow is a bidirectional connection, normally RTP one way and RTCP the other. To open it, the controller creates two ephemeral terminations and selects the logical interface in each case; the ICF then chooses IP addresses from the matching ranges and reports them back.
• Address translation and blocking: Clause 4.5 says that when address translation is used, the source termination overwrites packet addresses with those in the remote descriptor. Packets that do not match the local descriptor are silently discarded, which is how the middlebox filters traffic.
• Formal encoding: Clause 5 says the package may be encoded as ASN.1 or augmented Backus-Naur Form (ABNF). This matters for implementation because it tells protocol developers how the package syntax can be represented.

What terms does SIST-TS TS 101 332 V4.1.1:2004 define?

• middlebox - A physical implementation of an InterConnect Function (ICF).
• ICF - The InterConnect Function that the package is meant to control over the reference point.
• ephemeral termination - A temporary H.248 termination used to represent and control a flow.
• token bucket - The rate-control model used for tokenrate handling and silent discard of excess traffic.
• pin-hole - The permitted path through the middlebox, with a TTL that can expire.
• flow - A bidirectional connection between two logical channels, normally RTP and RTCP.
• MIDCOM Agent - The control role the MGC can act as when managing the middlebox.

Who uses SIST-TS TS 101 332 V4.1.1:2004?

SIST-TS TS 101 332 V4.1.1:2004 is used by engineers and equipment vendors implementing TIPHON Release 4 control of middleboxes over H.248/MEGACO. It is relevant when designing or integrating QoS control, media firewall behavior, address filtering, and IP-IP gateway functions in telecom and VoIP systems.

It is also useful to network architects and protocol implementers who need to map reference points into H.248/MEGACO behavior, especially for reference points I3 and T2. Quality and interoperability teams can use it to check that a controller and a middlebox agree on properties, events, statistics, and flow procedures.

Which standards are used with SIST-TS TS 101 332 V4.1.1:2004?

• ETSI TS 101 885 - Provides the Release 3 technology mapping of TIPHON reference point N to H.248/MEGACO, which this document complements.
• IETF RFC 2234 - Supplies ABNF rules for the formal syntax used in the package description.
• IETF RFC 3015 - Defines Megaco Protocol Version 1.0, the base protocol that carries the package.
• IETF RFC 2216 - Provides the Network Element Service Specification Template and the token bucket model referenced for rate control.

What does the SIST-TS TS 101 332 V4.1.1:2004 document contain?

The document contains a figure showing the entities involved in control over the reference point, plus the package definition in Clause 4. Clause 4 covers the package properties, the single event, the lack of signals, the two discard statistics, and the procedures for opening, translating, filtering, and stopping flows.

Clause 5 states how the package can be represented in ASN.1 or ABNF. Annex A gives an informative bibliography for background reading.

SLOVENSKI STANDARD
01-april-2004
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L]GDMD'HILQLFLMD]DKWHYSURWRNROQHJDYPHVQLND6SHFLILNDFLMD7,3+21
UD]ãLUMHQHJDSDNHWD+0(*$&2(03,&)NUPLOMHQMHSUHNUHIHUHQþQHWRþNH
Telecommunications and Internet Protocol Harmonization Over Networks (TIPHON)
Release 4; Interface Protocol Requirements Definition; TIPHON Extended
H.248/MEGACO Package (EMP) Specification; ICF Control over Reference Point
Ta slovenski standard je istoveten z: TS 101 332 Version 4.1.1
ICS:
33.020 Telekomunikacije na splošno Telecommunications in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

Technical Specification
Telecommunications and Internet Protocol Harmonization
Over Networks (TIPHON) Release 4;
Interface Protocol Requirements Definition;
TIPHON Extended H.248/MEGACO
Package (EMP) Specification;
ICF Control over Reference Point

2 ETSI TS 101 332 V4.1.1 (2002-06)

Reference
DTS/TIPHON-03027R4
Keywords
H.248, IP, MEGACO, network, protocol,
telephony, VoIP
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3 ETSI TS 101 332 V4.1.1 (2002-06)
Contents
Intellectual Property Rights.4
Foreword.4
Introduction .4
1 Scope.5
2 References.5
3 Definition.6
4 Middlebox Package.6
4.1 Properties.6
4.2 Events.7
4.3 Signals.7
4.4 Statistics.7
4.5 Procedures.8
5 Formal syntax.8
Annex A (informative): Bibliography.9
History .10

ETSI
4 ETSI TS 101 332 V4.1.1 (2002-06)
Intellectual Property Rights
IPRs essential or potentially essential to the present document may have been declared to ETSI. The information
pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found
in ETSI SR 000 314: "Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI in
respect of ETSI standards", which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web
server (http://webapp.etsi.org/IPR/home.asp).
Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee
can be given as to the existence of other IPRs not referenced in SR 000 314 (or the updates on the ETSI Web server)
which are, or may be, or may become, essential to the present document.
Foreword
This Technical Specification (TS) has been produced by ETSI Project Telecommunications and Internet Protocol
Harmonization Over Networks (TIPHON).
Introduction
The purpose of this H.248/MEGACO package is to extend the currently available standard packages to allow control of
Quality of Service and Media Firewall functions using the H.248/MEGACO protocol. It complements the Release 4
H.248/MEGACO Technology Mapping for Reference Point N (see TS 101 885 [1]).
ETSI
SCN Plane
5 ETSI TS 101 332 V4.1.1 (2002-06)
1 Scope
The present document is applicable to TIPHON reference point I3 and provides a H.248/MEGACO Package for use in
implementing the relevant interface.
Originating/
Originating/Terminating Network FG Terminating/
Intermediate
Terminating
Originating
Network FG
Terminal FG
Serving Home
Gateway FG
Network FG Network FG
User
Service
CR QoSPE CR QoS
...