ewsd v16

Information

GeoCENTREX

Group Features

A30828-X1150-C200-2-7629

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Group Features InformationGeoCENTREX

Trademarks:

All designations used in this document can be trademarks, the use of which by third parties for theirown purposes could violate the rights of their owners.

Copyright (C) Siemens AG 2000-2001

Issued by the Information and Communication Networks GroupHofmannstraße 51D-81359 München

Technical modifications possible.Technical specifications and features are binding only insofar asthey are specifically and expressly agreed upon in a written contract.

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InformationGeoCENTREX

Group Features

Reason for UpdateSummary:

technical supplementation

Details:

Chapter/Section Reason for Update

2.1.1 Group structure, topic

’Minigroup’

Enhancement for second dial tone

2.1.3 Group-specific private

numbering plan, ’Access

Code (AC)’

Enhancement for second dial tone

2.1.7 Intercept inserted link

2.1.8 Group-specific

announcements and tones

inserted link

Issue HistoryIssue

Number

Date of issue Reason for Update

01 12/2000 New issue

02 06/2001 technical supplementation

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A30828-X1150-C200-2-7629 5


Group Features

This document consists of a total of 27 pages. All pages are issue 2.

Contents

1 Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

2 Mode of operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82.1 Basic Functions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82.1.1 Group structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 92.1.2 Flexible group size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112.1.3 Group-specific private numbering plan . . . . . . . . . . . . . . . . . . . . . . . . . . . . 112.1.4 Central Dial In . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152.1.5 Emergency call service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152.1.6 Simulated facility groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152.1.7 Intercept . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152.1.8 Group-specific announcements and tones . . . . . . . . . . . . . . . . . . . . . . . . . 162.1.9 Security for network-wide O&M administration of GeoCENTREX business

groups . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 172.2 Traffic measurement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182.3 Interfaces & Terminal devices. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 182.4 Multiline hunting groups & queues . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 202.5 Closed user group & nailed-up connections . . . . . . . . . . . . . . . . . . . . . . . . 23

3 Subscriber controlled input . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

4 Call charge registration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

5 Administration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

6 Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

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A30828-X1150-C200-2-7629 7


Group Features

1 DefinitionGeoCENTREX group features are the part of GeoCENTREX functions which are re-sponsible for the definition, organization and administration of the GeoCENTREXgroups.

More information of other GeoCENTREX functions, please refer to GeoCENTREXOverview description.

Operator benefits– Other advantages of GeoCENTREX for the network node provider are increased

revenues from the expanded range of services, greater exploitation of existingswitching equipment and acquisition of new customer groups.

Subscriber benefits– Cost effectiveness– High reliability– No risk of obsolescence– Service by network provider operator– Flexibility and adaptation to customer requirements– Comprehensive range of services– Almost unlimited– Cost-effective options for companies with more than one location

"2.1 Basic Functions"

"2.2 Traffic measurement"

"2.3 Interfaces & Terminal devices"

"2.4 Multiline hunting groups & queues"

"2.5 Closed user group & nailed-up connections"

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Availability

The group features are available to all members of a GeoCENTREX business group.

1) For non-GeoCENTREX subscribers, restricted use of GeoCENTREX features ap-plies, see also Feature Description.

Interactions

For interaction with other features, see Feature Interactions.

2 Mode of operation

2.1 Basic FunctionsThe Basic Functions include:• Group structure

– GeoCENTREX Group– Business Groups– Subbusiness Groups– Minigroup– GeoCENTREX Complex

• Flexible group size• Group-specific private numbering plan

– GeoCENTREX directory numbering plan– Access code (AC)– Feature code (SC)– Call Type Overview

• Central Dial In• Emergency call service• Simulated facility groups• Intercept• Group-specific announcements and tones• Security for network-wide O&M administration of GeoCENTREX business groups

Analog ISDN

Subscriber X 1) X 1)

GeoCENTREX subscriber X X

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Group Features

2.1.1 Group structureAll GeoCENTREX subscribers are organized in groups. GeoCENTREX groups can bedefined locally or combined network-wide to form a business group.

GeoCENTREX group functions are as follows:– GeoCENTREX Group– Business Groups– Subbusiness Groups– Minigroup– GeoCENTREX Complex

Fig. 2.1 illustrates the different group structures. Different locations are assigned to dif-ferent network nodes.

Fig. 2.1 Group structure

Site B

Site A

GeoCENTREXsubbusiness

group fordevelopment

GeoCENTREX

group

GeoCENTREX

subbusin

ess

group for s

ales

GeoCENTREXbusiness group for

the company

GeoCENTREXgroup

Site C

GeoCENTREX

group

GeoCENTREXgroup

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GeoCENTREX Group

Subscribers are combined in order to give them joint group features (e.g. private num-bering plan).

A GeoCENTREX group is restricted to one exchange.

Besides the GeoCENTREX group number significant in one exchange, a public directo-ry number called GeoCENTREX group directory number can be assigned to eachGeo CENTREX group.

A directory number can only belong to one local GeoCENTREX group.

Business Groups

Different GeoCENTREX groups can be combined to form a business group, so a busi-ness group can extend over several exchanges (see Fig. 2.1).

All local GeoCENTREX groups must be assigned to the same business group.

For purposes of feature transparency, associated GeoCENTREX groups are identifiedby a common, network-wide unique business group identification (BGID).

Subbusiness Groups

Within the business groups, subbusiness groups (SUBBGID) can be formed which arenot restricted to one local network node and permit the restriction of GeoCENTREX fea-tures:– Restriction for internal calls– Restriction for call transfer– Restriction for call forwarding– Restriction for call waiting– Restriction for call hold

Features such as distinctive ringing and distinctive call waiting are also possible at asubbusiness level.

If a GeoCENTREX group is spread over more than one network node to form a businessgroup, and if subgroups are defined within that business group, it is possible to restricta member of such a subbusiness group in the case of calls from or to a partner outsidethe subbusiness group.

A subbusiness group must belong completely to one business group.

Minigroup

For GeoCENTREX groups with members who mostly telephone in the public switchedtelephone network, calls to the public switched telephone network without access codesare set up as for non-GeoCENTREX subscribers. But the subscribers can also use thefeature codes of the public network. However, an access code for calls to other subscrib-ers of the GeoCENTREX group has to be defined in the directory numbering plan. Thisaccess code must be dialed before an internal directory number or a GeoCENTREX ac-cess digit combination. Since an access code for internal calls is generally only used bysmall GeoCENTREX groups, this type of GeoCENTREX group is also known as a mini-group.

GeoCentrex Minigroup subscribers gets the public dial tone after going off hook and theinternal dial tone (second dial tone) after dialling the Minigroup access code (in contrastto Access code (AC) to public network).

There is no restriction on the number of subscribers and their features.

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Group Features

GeoCENTREX Complex

In one EWSD network node various GeoCENTREX groups can have a shared atten-dant. This is advantageous for local GeoCENTREX groups who share a common atten-dant station for call handling, billing, data handling, traffic data handling and/oradministration. Another useful application of this feature is the temporary sharing of anattendant station, for example during the vacation period.

See also Feature Description.

2.1.2 Flexible group sizeUp to 3000 GeoCENTREX groups can be administrated in an EWSD network node. Themaximum number of subscriber lines belonging to all GeoCENTREX groups of this net-work node is equal to the number of all subscriber lines administrated at the EWSD ex-change. Up to 90 GeoCENTREX groups can be connected to one LTG (Line/TrunkGroup).

2.1.3 Group-specific private numbering planA private directory numbering plan must be created for each GeoCENTREX group.

The following options are provided for the intercom directory numbering plan:• Internal directory numbers for calls within a GeoCENTREX group, business group,

subbusiness group.• Access codes for connections to specific user facilities to public network, calls to

PBX, to other GeoCENTREX groups, to Internet gateways• Directory number revaluation over intelligent network (IN)• Feature codes for activation, deactivation, interrogation and usage of features

If the public network is run by two or more carriers, GeoCENTREX subscribers are alsoable to explicitly select a carrier.

The GeoCENTREX numbering plan supports the public network numbering plan, includ-ing multiple local area codes in one exchange and variable-length directory numbers. Adecimal access code can be defined for dial-pulse phones to provide the same functionas dialing the asterisk "*" on a DTMF phone (e.g. "*3” and "83” have the same effect).

GeoCENTREX directory numbering plan

The directory numbers are subdivided as follows:• Local internal directory number

The local internal directory number is used to reach GeoCENTREX group internaldestinations. The length of the internal directory number can be up to 7 digits long(# is only available at the end of the number, it marks the ’ambiguous’ number).An internal directory number can be assigned to every PBX/PBX line (without directinward dialing).The customer can create the internal directory number independently of the publicdirectory number or include it as part of the public directory number.

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• Netwide internal directory numberThe netwide internal directory number is used to reach destinations of the samebusiness group. The length of the netwide internal directory number can be up to 7digits long (# is only available at the end of the number, it marks the ’ambiguous’number).The GeoCENTREX internal directory numbering plan for netwide internal directorynumbers is installed according to the same rules as the local directory numberingplan described above. The netwide internal number allows translation into a publicnumber to address a GeoCENTREX subscriber. This can be done in the local ex-change by code rating or central in dialog with an IN-based Signaling Control Point(SCP).

Access code (AC)

Access codes can consist of up to 5 digits including ★ and # . Further digits are possible.

Exception:

For GeoCENTREX ISDN subscribers the access code for the following features con-sists of a maximum of 3 characters:– Three Party Conference– Large Conference– Malicious Call Identification– Kickout– Subscriber Call Park– Call Completion to Busy Subscriber– Call Completion on No Reply– Access to IN-Features

Access codes can be defined for different functions and destinations:• Access to public network

The GeoCENTREX directory numbering plan supports the numbering plan for thepublic telephone network including several local area codes per network node andvariable length of the public directory numbers.

Two access types to the public network permit alternative charging:– private access– business accessIn both cases it can be specified whether or not the access is combined with the sec-ond dialing tone.These 4 alternatives can also be provided simultaneously, using dif-ferent access codes for each alternative.A GeoCentrex subscriber gets the internal dial tone after going off hook. After dial-ling the public network access code with second dial tone, he gets the public dialtone (in contrast to Minigroup).

• Location dialingA PBX (with or without direct inward dialing) can be integrated into the numberingplan and thus it can be reached via location dialing.The feature is administrated via the CATCODE mechanism.

• Usage of private facilitiesPrivate facilities such as paging equipment, dictation devices, door openers or voicemail servers on terminating tie lines or trunks can be accessed like anyGeoCENTR EX subscriber by simply dialing an access code.

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Group Features

• Access to attendantA single attendant or a group of attendants can be addressed by dialing a single-digit attendant access code (e.g. ‘9’).From the public network an attendant can be reached by dialing the GeoCENTREXgroup directory number followed by the attendant access code.

• Override implicit network access codeIn a GeoCENTREX group assigned implicit network access, so-called ‘mini groups’with calls mainly to the public network (see Minigroup), GeoCENTREX subscribershave to dial an access code prior to the intercom number to make calls within theirown GeoCENTREX or business group.

• Access to InternetVia this access code, GeoCENTREX subscribers can dial into the Internet and usethe Internet services.

• Group dialingTo use group dialing at least one public directory number needs to be administeredfor a local GeoCENTREX group. A subscriber located outside this localGeoCEN TREX group can reach each member of the local GeoCENTREX group bydialing the group code followed by the intercom number of the GeoCENTREX sub-scriber (like PBXs with direct dialling in).A public subscriber can reach a GeoCENTREX subscriber via the public directorynumber and the subscriber's internal number.Internal and public group dialing calls can be billed via different GeoCENTREX-spe-cific charge sites, see Call charge registration.

Feature code (SC)

The GeoCENTREX feature codes are group-specific codes to activate, deactivate, in-terrogate or use a GeoCENTREX feature. Most of the feature codes are used for sub-scriber controlled input and do not establish a call to a called party. Some feature codescan be combined with a called party number to establish a call using a certain feature(e.g. dial call waiting).

Feature codes may consist of up to 5 digits (including ★ and #) and are common for allmembers of a GeoCENTREX group. The feature codes can only be used if the groupmember has the appropriate feature authorization.

For each feature code it is possible to specify whether– the feature is restricted to the GeoCENTREX group– a PIN is available for activation, deactivation, interrogation and feature usage

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Call Type Overview

Fig. 2.2 Call types

Call type description for Fig. 2.2:– The GeoCENTREX subscriber A dials the internal number 9589, to reach the

Geo CENTREX subscriber B (see Local internal directory number).– The GeoCENTREX subscriber F dials the GeoCENTREX directory number 9589,

which has been set up as remote GeoCENTREX directory number in the networknode 2, to reach the GeoCENTREX subscriber B. (see Netwide internal directorynumber).

– The GeoCENTREX subscriber D dials the access code ’96’ followed by the publicbranch exchange internal directory number ’34’ of the subscriber E, connected tothe private branch exchange with DDI (see Location dialing).

– The GeoCENTREX subscriber F dials the group dialing access code 99 followed bythe internal number 9590 to reach the GeoCENTREX subscriber A (see Group dial-ing).

96

A

PBX

Locationdialing96-34

E34

DN: 5555589CXDN: 9589

GeoCENTREX groupNetwork node 2

GeoCENTREX groupNetwork node 1

local intern9589

external5555589

external7777755-9590

Group dialing99-9590

DN: 5555590CXDN: 9590

GRP-DN:7777755

netwide internal9589

DN: 745678CXDN.: 4444

G

F

D

A

B

C

GRP-AC:99

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Group Features

– The public subscriber G dials the public group directory number 7777755 followedby the internal number 9590 to reach the GeoCENTREX subscriber A (external call).

– The public subscriber C dials the public number 5555589 to reach theGeoCENTREX subscriber B (external call).

2.1.4 Central Dial InThe feature Central Dial In (CDI) allows a public subscriber (fixed network or mobile sub-scriber connected to a non-EWSD network node) to use the GeoCENTREX group direc-tory number plan for local and - depending on the subscriber's authorization or theproperties of the group - for network-wide destinations of the GeoCENTREX group, bydialing in via the public group directory number.


2.1.5 Emergency call serviceThis feature enables every GeoCENTREX subscriber, even those who are ’Fully-re-stricted, originating’, to make emergency calls directly using the public network accesscode and the usual emergency numbers of the public telephone network.


2.1.6 Simulated facility groupsThe number of calls that can be set up simultaneously from a GeoCENTREX group intothe public network or from the public network into the GeoCENTREX group, can be lim-ited. A counter is incremented during call set up and decremented during release foreach call from/into the public network. The counter for calls to the public network is in-dependent of the counter for calls from the public network. If the limit is reached, furthercall attempts from/into the public network are rejected. Further outgoing or incomingcalls can only be performed via the GeoCENTREX attendant. GeoCENTREX group in-ternal calls are not limited by this feature.

2.1.7 InterceptThe tones and intercept announcements defined and available in the EWSD system canbe assigned to each GeoCENTREX group for unsuccessful call attempts and operation-al errors. The following situations are covered:– call attempts to non-assigned GeoCENTREX directory numbers– outgoing calls from GeoCENTREX lines which contravene traffic restrictions– outgoing calls from GeoCENTREX lines that are restricted originating– incoming calls to GeoCENTREX lines that are restricted terminating– attempts to activate features in the absence of the appropriate access authorization

class (CATCODE)– nonwork directory number– code undefined

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The options for the treatment for such unsuccessful call attempts are:– to play an automatic intercept announcement– to apply a predefined tone– to play music– to set up a connection to a public network operator– to set up a connection to a GeoCENTREX subscriber or attendant

Combinations of these options are permitted, whereby the setting up of connections toto a GeoCENTREX attendant or a public network operator must be the last item in thesequence.

If GeoCENTREX-specific intercepts or tones are to be used, the relevant resourcesmust be specified in EWSD by the telecommunication company, if necessary as new re-quirements.

For more information, please refer to description Intercept and Cause-Value Assign-mentand System Behaviour.

Fig. 2.3 Example of intercept service

2.1.8 Group-specific announcements and tonesIn addition to the public announcements and tones, the following tone-specific indica-tions can be defined for internal calls:– Ringing tone– Call waiting tone– Dial tone

Calls entered in a queue can also be presented with a combination of announcements,tones and music.

Calls placed on hold can be presented with either an announcement, or a tone, or music.

For more information, please refer to description Intercept and Cause-Value Assign-mentand System Behaviour.

Announcement Music Special infor-mation tone

Busy tone

MultifunctionalAttendant Console

Operator inPSTN

The numberyou have calleddoes not exist.

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Group Features

2.1.9 Security for network-wide O&M administration ofGeoCENTREX business groupsFor central administration of network-wide GeoCENTREX business groups, special op-erator authorizations are necessary to guarantee that only specific operators of the tele-com company (with a special keyword) are allowed to administer these businessgroups.

In the following picture, business group A can be administered only by operator X andbusiness group B only by operator Y, even in the same switch (defined by the square).Even the local operator is not allowed to administer both groups.

Fig. 2.4 Security for network-wide O&M administration of GeoCENTREX businessgroups

If a business group uses the security mechanism, then all of its GeoCENTREX groupsin the switch are affected. All commands with CENTREX relevance (GeoCENTREX-specific and public commands, e.g. modification of public features for a GeoCENTREXsubscriber) are only allowed if the operator who does command input is authorized foradministration of the business group.

A business group which does not participate in the security mechanism is not affectedby this feature.

localoperator

Operator: X

Business group A

Business group B

Operator: Y

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2.2 Traffic measurementIn addition to the usual traffic measurement for analog and ISDN subscribers, EWSDprovides GeoCENTREX-specific traffic measurement.

With the counters for service and feature usage the customer can, for example, recordthe number of:– invocations– successful activations– acceptance– call forwarding attempts– calls matching the screening list– calls barred– calls retrieved– one-time override– connection attempts– successful CLIP requests per call– successful CLIR suspension per call– successful programming and activation– parking attempts– rejected calls

Customers can, if they wish, be provided with the traffic measurement data of their ownGeoCENTREX group and additionally, if available, the traffic measurement data of theGeoCENTREX MLHG/PBXs and respective queues.

For traffic measurement using the Multifunctional Attendant Console see Feature De-scription.

2.3 Interfaces & Terminal devicesThis section covers the following:– Access types– Terminal devices

Access types

A GeoCENTREX group can have one line or up to a maximum number of lines limitedby the network node.

The following subscriber lines are permitted in any combination:• Analog subscriber lines

(connection to EWSD via DLU or V5.x)• Analog PBXs with or without DDI connection to EWSD via DLU or V5.x• ISDN basic access connected to EWSD via DLU or V5.x• ISDN PBX with or without DDI, connection to EWSD via DLU or V5.x

V5.x interface:The V5.x interface is used for connecting peripheral units to EWSD. Standardizationpermits the use of OEM units. These units are known as AN (access network). With theV5.x interfaces, analog and ISDN accesses can be used.

The x in the abbreviation of V5.x stands for V5.1 or V5.2.

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Group Features

Fig. 2.5 Interfaces & terminal devices

GeoCENTREXgroup

Mulit linehuntinggroup orSubscriberhuntinggroup

attendantgroups

rotary

PCM30/24/analog

ISDNISDN-BA

analog rotary

bushbutton

bushbutton

analogattendantstation

Multifunctionalattendant console

ISDN-BA

ISDN attendantstation

ISDN-BA

analog

bushbutton

ISDN

PA/BA

PCM30 mobileSubscriber(DECT)

analog

analog

analog

analog

ISDN-BA

V5.x

NT

PBX

CPE

NT

NT

NT

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Terminal devices

The following terminal devices can be connected in a GeoCENTREX group(but the convenience depends on the performance of the terminal):• Analog telephones with dial or pushbutton• Customer Premises Equipment (CPE) such as

loudspeakers, dictating machines, paging equipment, etc.In EWSD, all equipment necessary for subscriber line specifications can be integrat-ed into a GeoCENTREX group.

• ISDN terminal devicesISDN voice and non-voice terminals are connected to the exchange by means of abasic access (2B+D). Basic facilities are provided by a functional protocol insofar asthey have been defined by CCITT/ITU Blue Book and ETSI. Supplementary serviceswithin GeoCENTREX can be handled by means of a keypad protocol.To be able to make use of the entire range of ISDN GeoCENTREX features, an ISDNtelephone that supports keypad functionality is required.GeoCENTREX attendant consoles likewise support the functional protocol definedby CCITT/ITU Blue Book and ETSI, with the addition of attendant-specific functions.It is possible to connect an additional analog terminal adapter to an ISDNGeoCEN TREX device. For these GeoCENTREX ISDN terminals (as well as forpublic ISDN terminals) some functional restrictions concerning the feature controlmay occur, because analog terminal adapters normally do not translate analog con-trol signaling (e.g. hook flashes) to ISDN signaling (D-channel protocol).

• PBXs:A GeoCENTREX group can include an analog or ISDN PBX with or without directdialing and its PBX lines. The GeoCENTREX feature range depends on the PBX.

• Mobile terminal devicesDevices with the DECT standard can be integrated via a V5.x interface into aGeo CENTREX group. They have the same range of features as a fixed networksubscriber.

2.4 Multiline hunting groups & queuesGeoCENTREX provides special hunting methods for multiline hunting groups (MLHG).The customer can equip a multiline hunting group with the queueing function. Call han-dling services can be assigned to all extensions of this multiline hunting group.

The multiline hunting group functions comprise the following:– Hunting numbers– Hunting methods– Queues in multiline hunting groups– Announcements for queued calls

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Group Features

Hunting numbers

Various types of numbers can be defined as directory number for the automatic searchfor a free line.• Pilot Directory Number (PDN)

Calls to this number are routed to a free member of the multiline hunting group onthe basis of a search algorithm (usually to the lowest number of the multiline huntinggroup).

• Hunt Service Number (HSN)The HSN is assigned to a specific analog line of the multiline hunting group. If thisnumber is dialed, the call arrives at this line if it is free. If it is busy, the search algo-rithm begins at this line.

• Non-Hunt Service Number (NSN)The NSN is assigned to a specific line (analog or ISDN) of the multiline huntinggroup. If this number is dialed, the call always comes to this line. If it is busy, no hunt-ing takes place.

Hunting methods

All calls arriving at a multiline hunting group can be handled by different lines of thegroup. The line is selected according to a search algorithm.

Fig. 2.6 Hunting methods

sequential circular uniform nonsequential

1.

longest periodfree2.

3. 1.

2. 3.

1.

2.

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The four possible hunting methods are as follows:

1. SequentialIncoming calls are distributed to the MLHG lines in a defined sequence. These linesare numbered. When the MLHG number is dialed, the hunt begins at the first lineand then proceeds in the sequence defined by the line numbers. If a hunt servicenumber is dialed, the hunt begins at this number. Hunting ends at the line with thehighest number.The result of this method is hunting with prioritized call distribution, the lower the linenumber, the more often incoming calls are routed to it.An incoming ISDN call to the MLHG is normally routed to the ISDN lines of the ML-HG. If no ISDN line is free, an idle analog line is hunted for.

2. CircularThe difference between circular and sequential hunting is that if a hunt service num-ber is dialed, hunting does not end at the highest line number but goes back andstarts again at the first line number. It ends, at the latest, when the dialed line isreached again.

3. UniformThis method works like the circular search algorithm except that the hunt alwaysstarts at the next line after the last served line. This search algorithm ensures thatthe same number of calls is assigned to each line – i.e., the traffic load is uniformlydistributed to all lines.

4. Non-sequentialIn the case of non-sequential hunting, the line which was idle the longest receivesthe call. This search algorithm ensures an equal work load on all lines.

In the sequential and circular hunting methods, the traffic load is not uniformly distribut-ed to all stations in a group.

The number of lines in a multiline hunting group handled with sequential hunting can berestricted to a specified number.

Queues in multiline hunting groups

With this feature, all calls arriving at the multiline hunting group are held if all lines arebusy. The calls are placed in the queue with an announcement, a tone or a sequence oftones and announcements until a line becomes idle or the caller hangs up. Only callsdialed with the multiline hunting group number are placed in the queue. The maximumnumber of calls placed in the queue can be configured.

In the case of overflow a new destination or an announcement can be defined.

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Group Features

Announcements for queued calls

EWSD offers up to 15 different fixed announcements and tones which can be used.These announcements and tones can be configured individually for eachGeoCENTREX group.

Further customer-individual announcments are possible using the Individual Digital An-nouncement System (INDAS).

A sequence of announcements or tones can be played to the waiting caller.

2.5 Closed user group & nailed-up connections

Closed user group (CUG)

The Closed user group (CUG) feature enables individual subscriber lines and PBXs tobe combined into groups in which traffic restrictions can be defined for group members,e.g. for calls to subscribers outside the CUG. Subscribers in a CUG can communicatewith each other but not normally with subscribers outside the CUG. Communication withsubscribers outside the CUG is only possible with additional authorization. Traffic re-strictions within a CUG can also be defined for members of the CUG. Members of aCUG can belong to one or more telecommunication networks.

The CUG feature is intended mainly for ISDN subscribers and ISDN PBXs. However,with some restrictions, it is also available for analog subscribers or PBXs if the signalingroutes necessary for CUG are available in the network.

CUGs can be defined in parallel to GeoCENTREX groups – i.e., GeoCENTREX sub-scribers can be members of one or more CUG. Existing GeoCENTREX traffic restric-tions supplement the CUG traffic restrictions.


Nailed-up connection (NUC)

The Nailed-up connection (NUC) feature permits fixed long-term connections betweentwo points (point-to-point connection), e.g. for provision of leased lines.

NUCs can be defined independently of the GeoCENTREX group between twoGeo CENTREX subscribers lines or between a GeoCENTREX subscriber line and anyoutside line in the public network.


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Capacity

The percentages indicate the number of authorized subscribers for the GeoCENTREXgroup features within the network node and their simultaneous application.

3 Subscriber controlled inputSubscriber controlled input is not possible for the group features.

4 Call charge registrationCalls made by GeoCENTREX subscribers can be recorded in the same way as callsfrom public subscribers i.e. call detail recording (AMA) and bulk metering via chargeunits are supported.

Compared to the AMA records made for calls from public subscribers, the AMA recordsfor GeoCENTREX subscribers contain additional GeoCENTREX information:• GeoCENTREX numbers (calling, called, redirecting)• Number of third party in case of call transfer• Business group Id• Account code• Indication if the calling party is a GeoCENTREX subscriber or attendant• GeoCENTREX call type (public, intercom, etc.)• Public business call type• Manager Secretary Team call (normal)• Manager Secretary Team call (direct)• GeoCENTREX charging site call (internal/remote)

In contrast to zoning in the public network, the GeoCENTREX group-specific zoning al-lows an internal call (local or remote) to be adapted to GeoCENTREX conditions.

For subscriber bulk metering it can be administrated on which counter of the subscrib-er's meter the levied charge units must be counted.

Different charge rates can be defined for group-internal calls and calls between groups.

Subscribers, PBX and attendants within a GeoCENTREX group can be divided into"charge sites" (see Fig. 4.1).

Analog ISDN

Authori-zation

Use Authori-zation

Use

GeoCENTREX subscriber 100% 100% 100% 100%

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Group Features

Fig. 4.1 Basic principle of division into GeoCENTREX charge sites

Network node 2

GeoCENTREXgroup 2

Network node 1

Site 3

Site 1

Site 2

Site 5

Site 4

Zone=5

Zone=5

Zone=6

Zone = 1

Non-GeoCENTREX-subscriber

GeoCENTREX zoning, free of charge

GeoCENTREX zoning, reduced tarif

GeoCENTREX zoning, reduced tarifPublic zoning

GeoCENTREXgroup 1

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5 AdministrationThe operator can perform all administration functions on the NetManager by means ofuser-friendly applications or MML commands.

Feature authorization

No individual subscriber authorization is required for the feature.

The GeoCENTREX group features are assigned to the GeoCENTREX group.

Subscriber access types

The feature can be used with the following types of subscriber access:

System administration

The following feature data can be administrated in the network node:– creation of announcements– recording by means of traffic measurement

For more information, please refer to OMN:EXCH-SY.

GeoCENTREX administration

For more information, please refer to OMN:EXCH-CTX.

Type Subscriber GeoCENTREX

Analog ISDN Analog ISDN

Main station --- --- X ---

Basic access --- --- --- X

PBX --- --- X ---

PBX with BA and/or PA --- --- --- X

PBX line --- --- X X

PBX line with Direct Dialing In (DDI) --- --- X X

PBX line, connected like a subscriber --- --- --- ---

Coinbox --- --- --- ---

Emergency call station --- --- --- ---

MLHG line --- --- X X

Basic attendant console --- --- X X

MAC attendant console --- --- --- X

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Group Features

6 RequirementsHardware• UI-LTG with OCANEQ speech equipment and INDAS for:

– customer individual announcements

Signaling• Signaling between the network nodes

Signaling system no. 7 (SS7)– ISDN user part (ISUP)– Telephony user part (TUP)

• Subscriber signalingAnalog– Dual-tone multi-frequency code (DTMF)– Pulse dialingISDN– Digital subscriber signaling system no.1 (DSS1)

Subscriber interfaces

The following interfaces for subscriber access can be used:– DLU– V5.1 interface– V5.2 interface

ewsd v16

Documents

ccittitu blue

assignmentand

search algorithm

multifunctional

unsuccessful

geo centrex

multiline

traffic measurement