Section 10.2.9.2.2. Variants of Payload Survivability

10.2.9.2.2. Variants of Payload Survivability

There are 3 variants of payload survivability, which depend on the type of trunk switching and have different advantages and disadvantages. ALR should be used as standard.

ALR with single number	Functions with any kind of trunk switching, even analog. A separate phone number must be assigned to each channel of the trunk switching Therefore requires many individual phone numbers and many entries in the ALTROUT table When the payload survivability route is used, party A sees the “Alternate Routing Number“ used for the call in addition to the dialed internal number When the payload survivability route is used, party B hears the “external call ring“ despite the fact that it is an internal call, but sees the internal phone number of party A.
ALR via multichannel trunk circuit under one call number	Only functions with multichannel ISDN CO lines. Only one phone number for all of the channels of a circuit Only one entry per circuit in the ALTROUT table Use of the “Artificial Calling Number“ requires agreement with the PSTN network carrier that the transmitted calling party number will not be checked, as it does not correspond to the actual phone number for the circuit (USER PROVIDED SCREENED). The same must be agreed for all source groups. The source group for which ALR is configured with ARTCNR must be available in this way from all other source groups. The entire carrier network must guarantee transmission of the Artificial Calling Number from all source groups without corruption. (No modification of the phone number) Call charges for using the payload survivability route cannot be uniquely assigned to the calling party When the payload survivability route is used, party A sees the “Alternate Routing Number“ used for the call in addition to the dialed internal number When the payload survivability route is used, party B hears the “external call ring“ despite the fact that it is an internal call, but sees the internal phone number of party A.
PUBDID	If PUBDID numbers are already configured for subscribers of an access point, these can also be used for payload survivability. Relatively high level of administration effort involved, as the PUBDID number has to be configured individually for each subscriber. 1 entry in the ALTROUT table for the entire source group The PUBDID number is retained in the event of a relocation In the case of payload survivability, the PUBDID number is displayed for the other party Call charges for using the payload survivability route can be uniquely assigned to the calling party

ALR with single number

At the CO line which is (also) to be used for the payload survivability of a source group, certain call numbers are configured for payload survivability.

Let us assume that the numbers 069-767-97, 069-767-98 and 069-767-99 have been reserved in Frankfurt for payload survivability. Up to 3 calls can then reach source group 3 simultaneously via alternative routes.

The INCALTRT digit analysis result must be configured in WABE for every access code.

This is configured through

Configuration Management > System Data > IPDA > IPDA Payload Survivability

Click New, enter Index, Routing Position, Phone Number and Access Code on the Basic Data tab and Save.

Configuration Management > Tables > Dial Plan > Dial Codes

Click New, select Delete Mask on the Edit pull-down menu.

Enter the Dial Code and Code Type and Save.

ADD-APRT:TYPE=ALTROUT,SRCGRP=3,POS=1,ALRTYPE=ALR,
                                    ALTRTNR=006976797,ACCODE=97; ADD-WABE:CD=97,DAR=INCALTRT;

ADD-APRT:TYPE=ALTROUT,SRCGRP=3,POS=2,ALRTYPE=ALR,
                                    ALTRTNR=006976798,ACCODE=98; ADD-WABE:CD=98,DAR=INCALTRT;

ADD-APRT:TYPE=ALTROUT,SRCGRP=3,POS=3,ALRTYPE=ALR,
                                    ALTRTNR=006976799,ACCODE=99; ADD-WABE:CD=99,DAR=INCALTRT;

This insertion sequence means that ACCODE 97 is at the top of the list and is occupied first.

Note regarding ALTRTNR

Specific rules must be observed for the Alternate Routing Number ALTRTNR:

ALTRTNR must contain the access code for CO breakout.
If the source groups are distributed across different local networks, the local network access codes must also be specified (see example).
The access code setting for CO breakout must be identical in all source groups. The destination number must be accessible in the same way from all other source groups.
ALTRTNR cannot be modified throughout the entire network with LCR (no REROUTE-INTERN).
ALTRTNR must be routed in each source group on a “source-dependent“ basis.

Note regarding AMO parameter POS (AMO APRT:ALTROUT)

The AMO parameter POS is optional. If this parameter is not specified, the entry is inserted at the end. The table is always kept compact starting at POS=1. If a specific POS value is specified, the table entry is only entered at this position if this position is already occupied or if it is the first free position. If this position is not free, the entries following POS are shifted back. If this position is not free, the entries following POS are shifted back. If an entry is deleted, all subsequent entries are shifted forwarded by one position. POS is important when multiple entries are made for a source group. Assignment of the specified alternative routes is in ascending order according to the POS value.

ALR via multichannel trunk circuit under one call number

At the CO line, 30 channels are available, for example, to a source group for payload survivability, all of which can be reached via the same call number. In Munich, for example, this could be the number 089-722-9000.

The INCALTRT digit analysis result must be configured in WABE for the access code 9000.

Furthermore, up to 30 calls, for example, can reach source group 1 simultaneously via alternative routes. However, as all calls are routed to the same call number (ACCODE, AMO APRT:ALTROUT), the call processing is faced with the problem of correctly assigning the alternative route calls. To this end, an identification number has to be transmitted with each call. This is realized by replacing the Calling Party Number. Precisely which numbers will be available to this end is configured via the parameters ARTCNR (Artificial Calling Number) and ARTCNRG (Artificial Calling Number Range).

The Artificial Calling Number is configured on a target-dependent basis with the information on a specific source group. However, this number is used at the source, i.e. at the trunk access which leads into the alternative route. The value is ultimately used as the Calling Party Number. As carriers do not allow freely selectable Calling Party Numbers, an agreement must be made with the carrier concerning the use of the Artificial Calling Numbers). The carrier must deactivate checking of the Calling Party Number (CLIPNOSCREEN).

Configuration example:

	Configuration Management > System Data > IPDA > IPDA Payload Survivability Click New, fill in all fields for alternative routing on the Basic Data tab and Save. Configuration Management > Tables > Dial Plan > Dial Codes Click New, select Delete Mask on the Edit pull-down menu. Enter the Dial Code and Code Type and Save.
	`ADD-APRT:TYPE=ALTROUT,SRCGRP=1,ALRTYPE=ALR, ALTRTNR=00897229000,ACCODE=9000,ARTCNR=1000, ARTCNRNG=30;` `ADD-WABE:CD=9000,DAR=INCALTRT;`

Note regarding ARTCNR

Specific rules must be observed for the Artificial Calling Number ARTCNR:

The ARTCNR ranges for different circuits and source groups must not overlap.
The ranges must be big enough to allow the desired maximum number of calls via the payload survivability route on a circuit.
This ARTCNR range must NOT be reserved in WABE.
The entire carrier network must guarantee transmission of the ARTCNR range from all source groups without corruption. (No modification of the phone number)

PUBDID

Subscribers of a source group have a Public DID number in the local CO. In other words, Berlin-based subscribers can be reached directly both via the central OpenScape 4000 switch’s Munich dial-in and via their Berlin dial-in number. For example: a subscriber could be reached not only via 089-722-12345, but also via 030-386-789 (different extension numbers/branch concept.

Setting the PUBDID number: [TON: Type Of Number - NPI: Numbering Plan Identifier]

	Configuration Management > Station > Station Click Search and go to subscriber. Enter the Sation No., Numbering Plan Identifier and Type of Number (TON) on the Basic 3 tab under Primary Rate Interface and Save.
	CHANGE-SDAT:STNO=12345,TYPE=DATA1,PUBNUM=30386789, TON=NATIONAL,NPI=ISDN;

Other settings made using the AMOs DNIT and DIDCR are required.

If this mechanism for payload survivability is to be used, it is activated as follows:

	Configuration Management > System Data > IPDA > IPDA Payload Survivability Click New, enter the Position and Type Of Routing on the Basic Data tab and Save.
	`ADD-APRT:TYPE=ALTROUT,SRCGRP=2,POS=1,ALRTYPE=PUBDID;`

However, it is also possible to configure one of the ALR procedures for payload survivability for source groups.

Table 47. AMO APRT parameters in ADD branch under TYPE=ALTROUT

AMO	Parameter	Sprache/ Language	Beschreibung/ Description
APRT	SRCGRP	d	Source Group Index Zuordnung des Access Points in eine Source Group. Die Access Points einer Source Group sind für Payload Survivability über einen bestimmten Amtsanschluss erreichbar.
	SRCGRP	e	Source Group Index Assignment of the Access Point to a Source Group. The Access Points of one Source Group are reachable via a distinct CO trunk for Payload Survivability.
	POS	d	Position Index des Eintrags in der Alternate Routing Tabelle. [1 .. 500] Siehe auch: Section 2.9.2.2, “Note regarding AMO parameter POS (AMO APRT:ALTROUT)”
	POS	e	Position Index of the entry in the Alternate Routing Table. [1 .. 500] See also: Section 2.9.2.2, “Note regarding AMO parameter POS (AMO APRT:ALTROUT)”
	ALRTYP	d	Alternate Routing Typ des Eintrags. 3 Typen sind möglich: ALR: Alternate Routing über eine DID, DIT oder PRI Nummer. NOALR: Kein Alternate Routing Pfad PUBDID: Alternate Routing über Public DID Nummer, d.h. Teilnehmer haben eine zweite Nummer, unter der sie über den Amtsanschluss für die angegebene Source Group aus dem öffentlichen Netz erreichbar sind.
	ALRTYPE	e	Alternate Routing Type of the Entry 3 types are possible: ALR: Alternate Routing via a DID, DIT or PRI number. NOALR: No Alternate Routing PUBDID: Alternate Routing using a public DID number. Subscribers are reachable by a second number via the CO access for the specified Source Group.
	ALTRTNR	d	Rufnummer für Alternate Routing Vollständige Rufnummer des Alternate Routing Anschlusses Siehe auch: Section 2.9.2.2, “Note regarding ALTRTNR”
	ALTRTNR	e	Alternate Routing Number. Complete number of the Alternate Routing access See also: Section 2.9.2.2, “Note regarding ALTRTNR”
	ACCODE	d	Access Code Nebenstellennummer des Alternate Routing Anschlusses, d.h. ALTRTNR ohne Vorwahl und Amtsnummer. Maximal 6-stellig.
	ACCODE	e	Access Code Extension Number of the ALternate Routing Access. ALTRTNR without Area and Office Code. Maximum 6 digits.
	ARTCNR	d	Artificial Calling Number Maximal 6-stellige Nummer, welche zur Identifikation des Rufes als “Nummer des Rufenden” übertragen wird. Diese Nummer ist die erste eines Bereichs (siehe ARTCNRNG), der für diese Zwecke genutzt wird. Siehe auch: Section 2.9.2.2, “Note regarding ARTCNR”
	ARTCNR	e	Artificial Calling Number. A number with a maximum of 6 digits. Is given als “Calling Party Number” to identify the call. This number is the first of a range (see ARTCNRNG) used for that purpose. See also: Section 2.9.2.2, “Note regarding ARTCNR”
	ARTCNRNG	d	Artificial Calling Number Bereich Gibt an, wieviele Artificial Calling Numbers einschließlich ARTCNR zur Verfügung stehen [1 .. 99999].
	ARTCNRNG	e	Artificial Calling Number Range Specifies, how many Artificial Calling Numbers including ARTCNR are available [1 .. 99999].

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