One document matched: draft-taylor-megaco-enhalpkgs-01.txt
Differences from draft-taylor-megaco-enhalpkgs-00.txt
Internet Engineering Task Force Martin Taylor
Internet Draft CopperCom
Document: draft-taylor-megaco-enhalpkgs-01.txt Kevin Boyle II
Category: Standards Track Nortel Networks
C. Michael Brown
March 2002
Megaco/H.248 Enhanced Analog Line Packages
Status of this Memo
This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026 [1].
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1. Abstract
This document provides proposed definitions for two supplemental
packages for Megaco/H.248. These packages address support of
functionality for standard and enhanced telephony services delivered
over analog line terminations, including line-side answer
supervision and the delivery of call metering pulses.
2. Conventions used in this document
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in
this document are to be interpreted as described in RFC2119 [2].
3. Document Organization
The subsequent text in this document is organized into the following
major sections:
* Introduction
* Description of the Extended Analog Line Supervision Package
* Description of the Automatic Metering Package
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* References
* Author's addresses
4. Introduction
The Analog Line Supervision Package defined in Annex E of RFC3015
[3] supports basic telephony services, using on-hook and off-hook
events, and a ringing signal. Some telephony services delivered
over analog line terminations have additional supervisory signaling
requirements that are not met by this package. The packages defined
in this document are intended to meet the needs of the following
supervisory signaling functions:
Line-side answer supervision _ this function provides a positive
notification to a calling line that the called line has answered.
This notification may be used by customer premises equipment, for
example, to begin timing the call for local billing or charging
purposes.
Network disconnect _ many switching systems provide this signal
following the termination of an active call if a party remains off-
hook for some period of time following the other party going on-
hook. The network disconnect notification may be used by customer
premises equipment to release resources associated with the call.
Metering pulses _ metering services provide subscribers with real-
time information about charging of calls in progress. These
services make use of customer premises equipment that shows a count
of "units" consumed by chargeable calls, where each unit has a fixed
monetary value. To increment the counter in the metering equipment,
the switching system sends certain kinds of pulses over the line,
either during the call or immediately following termination of the
call. These pulses typically consist of short bursts of 12 kHz or
16 kHz tones, although other types of metering pulse such as brief
periods of polarity reversal or 50 Hz tones are also seen.
To meet these needs, two supplemental packages are proposed.
The Extended Analog Line Supervision package is defined as an
extension of the Basic Analog Line Supervision package, and includes
two new signals: Line-Side Answer Supervision and Network
Disconnect. This package provides support for all the Loop-Start
supervisory signaling requirements identified by GR-506 [4].
The Automatic Metering Package provides a means to apply metering
pulses on an analog line termination. The package includes signals
requesting the automatic application of pulses at fixed intervals as
well as the application of pulse bursts, statistics that may be used
to track the actual number of pulses applied, and an event that may
be used to trigger periodic reporting of the count of pulses
applied.
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5. Extended Analog Line Supervision Package
PackageID: xal (0x0043)
Version: 1
Extends: al
This package defines events and signals necessary to support analog
telephony services where line-side answer supervision and/or network
disconnect capabilities are required.
5.1 Properties
None.
5.2 Events
None.
5.3 Signals
Line-side Answer Supervision
SignalID: las (0x0003)
Indicates that the called party has answered. The signal that is
sent on the line is provisioned in the MG. Typically this signal
involves a reversal of polarity of the current feed on the line.
Signal Type: OnOff
Additional Parameters: None
Network Disconnect
SignalID: nd (0x0004)
Indicates that the far-end party has disconnected. The signal
that is sent on the line is provisioned in the MG. Typically
this signal involves a brief removal of the dc voltage on the
line.
Signal Type: Brief
Duration: Provisioned
Additional Parameters: None
5.4 Statistics
None.
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5.5 Procedures
The Network Disconnect signal is typically used when a called or
calling party remains off-hook after the other party has hung up.
In these circumstances, some telephony services provide dial tone to
the off-hook phone after a period of several seconds has elapsed.
The Network Disconnect signal would normally be applied just prior
to the re-application of dial tone on the line.
6. Automatic Metering Package
PackageID: amet (0x0044)
Version: 1
Extends: None
This package supports the automated application of repetitive
metering pulses to an analog line termination. It provides a
facility whereby the actual number of metering pulses applied to the
termination can be periodically reported to the MGC for verification
purposes.
6.1 Properties
None.
6.2 Events
Periodic report
EventID: pr (0x0001)
This event is used in conjunction with the "enable metering" and
"metering pulse burst" signals defined in this package. It is
detected when the value of the "pulse count since last report"
statistic reaches the value specified in the "report period"
parameter.
This event does not have any parameters for the observed event
descriptor since it will be reported only when "pulse count since
last report" is equal to "report period", which is a value
already known to the MGC.
This event is not detected when the application of signals is
stopped due to an MG failure, a customer line state event (e.g.
on-hook), or by an explicit command from the MGC. The MGC needs
to read the value of the statistic "pulse count since last
report" in those cases, using an AuditValue command.
EventsDescriptor parameters:
Report Period
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ParameterID: rp (0x0001)
Type: Integer
This parameter specifies the period of metering reports in
terms of pulse counts. There is no default value for this
parameter, and it must be specified with a non-zero value.
ObservedEventsDescriptor parameters:
None.
6.3 Signals
Enable Metering
SignalID: em (0x0001)
This signal starts the automatic generation of metering pulses on
the termination. The type and duration of the pulses to be
applied are provisioned in the MG.
Signal Type: OnOff
Duration: Variable
Additional Parameters:
Pulse Count
ParameterID: pc (0x0002)
Type: Integer
This parameter specifies the number of metering pulses to
be applied to the termination. If the value of this
parameter is zero, or if no value is supplied for this
parameter, then the repetitive application of metering
pulses shall continue until stopped by other mechanisms
(for example, the detection of an event, or the replacement
of the Signals Descriptor).
Pulse Repetition Interval
ParameterID: pri (0x0003)
Type: Integer
This parameter specifies the interval between repetitions
of metering pulses on the line, in milliseconds. It
represents the time that should elapse between the leading
edge of a pulse and the leading edge of the succeeding
pulse. There is no default value for this parameter, and
the MGC should always provide a positive non-zero value.
Metering Pulse Burst
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SignalID: mpb (0x0002)
This signal causes a burst of metering pulses to be applied to
the termination.
Signal Type: Brief
Duration: Variable
Additional Parameters:
Burst Pulse Count
ParameterID: bpc (0x0004)
Type: Integer
This parameter specifies the number of metering pulses to
be applied as a burst on the line. The type, duration and
pulse repetition interval for the metering pulses
comprising the burst are provisioned in the MG. The default
value of this parameter, which shall apply if the parameter
is omitted from the SignalsDescriptor, is 1.
6.4 Statistics
Current Pulse Count
StatisticsID: cpc (0x0001)
This statistic represents the total number of metering pulses
that have been applied on an analog line termination since the
last time its value was reset to zero by means of the "enable
metering" signal defined in this package.
Pulse Count Since Last Report
StatisticsID: pcslr (0x0002)
This statistic represents the number of metering pulses that have
been applied on an analog line termination since the last meter
report event, or since the last time its value was reset to zero
by means of the "enable metering" signal defined in this package.
The recognition of the periodic report event and generation of a
corresponding notification resets the value of this statistic to
zero.
6.5 Procedures
On receiving a SignalsDescriptor containing the signal em, an MG
shall set the values of the statistics cpc and pcslr to zero. The
MG shall apply the first metering pulse to the termination
immediately, and then apply subsequent metering pulses at intervals
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as specified by the value of the pulse repetition interval parameter
pri.
The MG shall increment by one the values of the pulse count
statistics cpc and pcslr for each metering pulse that is applied to
the termination, regardless of whether the pulse was generated as a
result of the em signal or as a result of the mpb signal.
If the value of the parameter pc associated with the signal em is
non-zero, then the repetitive application of metering pulses should
be continued until the value of the statistic cpc is equal to the
value of the parameter pc. In this case, the MGC should include a
SignalType parameter in the Signals Descriptor, specifying the
signal type Brief, to override the OnOff signal type for the signal
em.
If the value of the parameter pc is zero or if this parameter is not
supplied by the MGC, then the repetitive application of metering
pulses should continue until either an event (other than pr) is
detected, or until the SignalsDescriptor is replaced with a new
SignalsDescriptor that does not include the signal em.
If, following the application of any metering pulse (regardless of
whether it was generated as a result of the signal em or as a result
of the signal mbp), the EventsDescriptor contains the event pr, and
if the value of pcslr is equal to the value of the EventsDescriptor
parameter rp, then the pr event shall be notified, and the value of
the statistic pcslr shall be reset to zero. The detection of the
event pr shall not cause the termination of the signal em or the
signal mbp, even if the KeepActive flag is not set for the pr event.
The repetition rate for the application of metering pulses to the
termination may be changed during a call by writing a new
SignalsDescriptor containing the signal em, specifying a new value
of the pulse repetition interval parameter pri. In this case, the
SignalsDescriptor should contain a KeepActive flag for the signal
em, and the MG should transition to the new pulse repetition
interval after the next metering pulse has been applied.
A metering pulse burst may be applied while a metered call is in
progress, for example to take account of a chargeable mid-call
action by the subscriber. In this case, the MGC should send a new
SignalsDescriptor that contains the em signal with a KeepActive
flag, together with the mpb signal. The MG should continue to apply
metering pulses at the repetition interval specified by the pri
parameter of the em signal, while in addition applying the metering
pulse burst. The MG should ensure that the pulses comprising the
pulse burst are applied in such a manner as not to interfere with
the pulses comprising the repetitive background metering, respecting
any minimum inter-pulse interval that may be needed to ensure proper
recognition of pulses by customer premises equipment.
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When an MG is generating metering pulses as a result of an active em
signal, and receives a new SignalsDescriptor containing an em signal
with a KeepActive flag, it shall not reset the values of the
statistics cpc and pcslr to zero.
The detection of an event such as on-hook while a metering pulse is
being applied to a termination should not cause truncation of the
pulse. Once a pulse has started to be applied, the application of
the pulse should continue for the full duration provisioned in the
MG.
8. Formal Syntax
Not applicable.
9. Security Considerations
Not applicable.
10. References
Informative
1 Bradner, S., "The Internet Standards Process -- Revision 3", BCP
9, RFC 2026, October 1996.
2 Bradner, S., "Key words for use in RFCs to Indicate Requirement
Levels", BCP 14, RFC 2119, March 1997
Normative
3 Cuervo, et al., "Megaco Protocol Version 1.0", RFC 3015, November
2000
4 Telcordia, "Local Switching System Generic Requirements _
Signaling for Analog Interfaces", GR-506-CORE, June 1996
11. Acknowledgments
None.
12. Author's Addresses
Martin Taylor
CopperCom
3600 FAU Boulevard
Boca Raton, FL 33431
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Phone: (561) 239 6694
Email: mtaylor@coppercom.com
Kevin Boyle II
Nortel Networks
35 Davis Drive
Research Triangle Park, NC USA 27709
Phone: (919) 991-2690
Email: kboyle@nortelnetworks.com
C. Michael Brown
1104 Hemingway Drive
Raleigh, NC USA 27609
Email: cmbrown@mindspring.com
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13. Expiration Date
This memo is filed as <draft-taylor-megaco-enhalpkgs-01.txt>, and
expires September 1, 2002.
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