Table Of Contents
Conditional A-Number Modification
Document Release History
This document describes the Conditional A-Number Modification feature. This feature is described in the following sections:
This feature introduces the ability to modify the A-number based on the Presentation Indicator in the Initial Address Message (IAM) message or its equivalent. In this feature, A-numbers encountering this result in analysis are modified with a user-defined prefix when the value of the stored presentation restriction data indicates that the number is restricted or unavailable. If this is not the case, the A-number is not modified and analysis continues.
Note If additional instances of A-number modification occur as analysis continues, the A-number can be further modified.
This feature can be used for SS7 ITU and SS7 UK routes. The analysis process for this feature is as follows:
Step 1 Extracting the A-number or Calling Line Identity (CLI) information. This information is found in the following parameters:
•For UK networks—Presentation Number CLI (PN-CLI) or Network Number CLI (NN-CLI) if PN-CLI is not present.
•For ITU networks—Calling Party Number CLI (CgPn-CLI)
Step 2 Extracting the CLI Blocking Indicator (CBI), if present (only in UK networks).
Step 3 Converting the NN-CLI to International format and setting Nature of Address (NOA) accordingly.
Step 4 Determine the privacy marking associated with the CLI information.
Step 5 Adding the user-configured prefix to the A-number. The configured digits indicate the privacy status of this number.
Description of CLI Information
The CLI information is carried in two distinct parameters which may both be passed during signaling for the same call. Each provides information for a different reason as given below:
•CgPn-CLI/NN-CLI—Used to identify the point of ingress to the PSTN network and can be used for the purposes of billing identification/call tracing purposes. This number is sometimes referred to as the Full CLI.
•PN-CLI—Used to provide the called party with a return number that can be dialed. It is normally passed where the number the caller wishes to be displayed to the called party differs from the point of access to the PSTN network. This may for example be provided for telemarketing when working from home, so that an office number is provided for any call back rather than the home number.
Note The number that is passing through the Internet Dial Platform on to the Radius server is the CgPn-CLI/NN-CLI and it is this number that must be prefixed when the privacy settings demand it.
Determination of Privacy Status - UK Networks
The CLI privacy status for UK networks is given using the following three classifications:-
•Available—Calling party has access to CLI Presentation (CLIP)/CLI Restriction (CLIR) supplementary services and has not chosen to prevent display of their CLI information.
•Withheld—Calling party has access to CLIP/CLIR services and has chosen to prevent display of their CLI information.
•Unavailable—Calling party either does not have access to CLIP/CLIR services or there is no CLI information to pass. With this category the information is still passed in SS7 messaging unless the CLI information is actually absent.
For this feature, the privacy associated with the PN-CLI is used to determine the conditional number modification and if that number is not present, then the privacy marking on the NN-CLI is used. If applicable, the resulting prefix digits are applied to the A-number.
Privacy is determined by a combination of the Identity Qualifier (IQ) in the respective CLI parameters with the IAM message indicator field CBI. When a PN-CLI is present, the privacy status is taken from the associated IQ alone, as the presence of a PN-CLI implies that a calling party has access to CLIP/CLIR services, so CBI is ignored. When no PN-CLI is present, the NN-CLI is checked for privacy and the CBI is also checked and has a bearing on the status.
The following table provides the method of privacy determination for each of the CLI numbers:
Table 1 BT-NUP Privacy Matrix
CLI Type CBI IQ Privacy Classification
Determination of Privacy Status - ITU Networks
The CLI privacy status for ITU networks is given using the following three classifications:-
•Presentation allowed (Available)—Calling party has access to CLIP/CLIR supplementary services and has not chosen to prevent display of their CLI information.
•Presentation restricted (Withheld)—Calling party has access to CLIP/CLIR services and has chosen to prevent display of their CLI information.
•Address not available (Unavailable)—Calling party either does not have access to CLIP/CLIR services or there is no CLI information to pass. With this category the information is still passed in SS7 messaging unless the CLI information is actually absent.
For this feature, the value of the presentation restriction indicator field in the CgPn-CLI is used to determine the conditional number modification. The presentation restriction indicator field is two bits in length and value of that field indicates privacy status as follows:
•00—Presentation allowed (Available)
•01—Presentation restricted (Withheld)
•10—Address not available (Unavailable)
Expected A-Number Format
To keep the CLI information uniquely identifiable regardless of what type of network it enters, the CLI is reformatted into an International number (ITU-T format) where it is not already presented as such. The following CLI number formats will be, where appropriate, re-formatted to International format.
•ITU International format—NOA is given as International and the number comprises the Country code followed by the National significant number (for example, 44 1444 234567).
•ITU National format—NOA is given as National and the number comprises the National significant number (for example, 1444 234567).
•UK Specific International format—NOA is given as National and the number is comprised of a zero prefix followed by Country code and National significant number (for example, 0 44 1444 234567).
This feature provides the following benefits:
Identifies Restricted Calls
Provisioning this feature enables the Cisco PGW 2000 to add a prefix to calls that have a Restricted CLI value. That prefix will enable RADIUS servers in your network to identify that call as Restricted.
This feature has the following restriction:
•When provisioning a conditional A-number modification value, you can only insert digits into the string for that command instance. In any other type of A-number modification operation, you can add and subtract digits in the same command instance.
Related Features and Technologies
The following features and technologies are related to this feature:
•Country Code Prefix Capability For National and International Switching Applications
This document contains information that is related strictly to this feature. The documents that contain additional information related to the Cisco Media Gateway Controller (MGC) are listed below:
•Release Notes for Cisco Media Gateway Controller Software Release 9.5(2)
•Cisco Media Gateway Controller Hardware Installation Guide
•Regulatory Compliance and Safety Information for the Cisco Media Gateway Controller
•Cisco Media Gateway Controller Software Release 9 Installation and Configuration Guide
•Cisco Media Gateway Controller Software Release 9 Provisioning Guide
•Cisco Media Gateway Controller Software Release 9 Dial Plan Guide
•Cisco Media Gateway Controller Software Release 9 MML Command Reference
•Cisco Media Gateway Controller Software Release 9 Messages Reference Guide
•Cisco Media Gateway Controller Software Release 9 Billing Interface Guide
•Cisco Media Gateway Controller Software Release 9 Management Information Base Guide
•Cisco Media Gateway Controller Software Release 9 Operations, Maintenance, and Troubleshooting Guide
The hardware platforms supported for the Cisco MGC software are described in the Cisco Media Gateway Controller Hardware Installation Guide.
Prerequisites for Using this Feature
You must have Cisco Media Gateway Controller (MGC) software Release 9.5(2). Prerequisites for this release can be found in the Release Notes for the Cisco Media Gateway Controller Software Release 9.5(2).
Creating Dial Plan Data
The following sections describe the tasks related to creating a dial plan for this feature:
For more detailed information about how to add, modify, and delete dial plan data and how to retrieve that data for your Cisco MGC, refer to the Cisco Media Gateway Controller Software Release 9 Dial Plan Guide.
Dial Plan Prerequisites
Use the tables in Appendix C of the Cisco Media Gateway Controller Software Release 9 Dial Plan Guide to plan the provisioning of your dial plans.
Dial Plan Procedures
Perform the following procedures to create a dial plan for this feature:
Adding Digit Modification String Data
The Digit Modification is accessed by the results to yield a string of numbers (digits) to apply to an A-number or B-number. To add a DIGMODSTRING list and add digit strings, complete the following steps:
Step 1 Enter the following command on the active Cisco MGC at the Man-Machine Language (MML) prompt:mml> numan-add:digmodstring:custgrpid="cgid", name="dname", digstring="dstring"
•cgid—Indicates the customer group ID. This is a 4-digit alphanumeric string.
•dname—MML name of the digit modification string.
•dstring—String of digits to modify.
Note Over-decadic digits can be used in your prefix. You must ensure that only over-decadic digits B and C are used in your prefix if the call data is routed through a H.323 network. B and C are the only over-decadic digits that are supported in H.323. If you use any of the other over-decadic digits in your prefix, once the call data enters a H.323 network through the Cisco H.323 Signaling Interface (HSI) the A-number will be forwarded without those over-decadic digits.
For example, to add an digit modification string, 666, called restpfx, enter the following MML command:mml> numan-add:digmodstring:custgrpid="T002",name="restpfx",digstring="666"
Step 2 To verify the command was executed successfully, enter the command:mml> numan-rtrv
Step 3 Repeat steps 1 and 2 for each entry you add to the digit modification string list.
Tip An implied index, which contains a single string of digits to be applied to the calling number or called number, is used to access the DIGMODSTRING list.
Adding A-Number Modification Result Table Data
Results are used with number analysis. To add an A-number modification result table to the dial plan, complete the following steps:
Step 1 Enter the following command on the active Cisco MGC at the MML prompt:mml> numan-add:resulttable:custgrpid="cgid", name="resnam", resulttype="AMODDIG", dw1="dw1", dw2="0", dw3="dw3", dw4="1", setname="snam"
•cgid—Indicates the customer group ID. This is a 4-digit alphanumeric string.
•resnam—MML name of the result table.
•dw1 (dataword1)—Provides an index into the Script table in the MGC database, where the details of the Script table, such as gateway type, language, location, and so on are stored. This is an integer.
Note When adding an index in the Script table, be sure the value you enter is a valid value in the Script table.
Caution Dataword 2 (dw2) cannot be used to subtract digits when you are using dataword 4 (dw4) to add A-number modification result data.
•dw3 (dataword3)—Indicates if an optional Address Complete Message (ACM) is to be sent when the confirmation of script invocation is received (for dw2, CallType = 1) from the gateway. This is an integer.
•sname—Indicates the MML result set name for this AMODDIG result type. The set name is user configured and can be as many as 20 alphanumeric characters.
For example, to add an A-digit tree to the customer group ID t100, enter the following MML command:mml> numan-add:resulttable:custgrpid="T002", name="result5", resulttype="AMODDIG", dw1="1", dw2="0", dw3="restpfx", dw4="1", setname="setname1"
Step 2 To verify the command was executed successfully, enter the command:mml> numan-rtrv
Step 3 Repeat steps 1 and 2 for each A-number modification result table you want to add.
Adding A-Number Digit Tree Data
The A-Digit Tree contains entries, in blocks of sixteen, for each calling number. Its output is an index to the Result table or an indication that no further action is necessary. To add an A-Digit Tree to your dial plan, complete the following steps:
Step 1 Enter the following command on the active Cisco MGC at the MML prompt:mml> numan-add:adigittree:custgrpid="cgid", digitstring="dstring", callside="cs", setname="snam"
•cgid—Indicates the customer group ID. This is a 4-digit alphanumeric string.
•dstring—Defines the digit string.
•cs—Indicates the side of the call, either originating or terminating.
•sname—Indicates the MML result set name for this A-number digit tree. The set name is user configured and can be as many as 20 alphanumeric characters.
For example, to add an A-digit tree to the customer group ID t100, enter the following MML command:mml> numan-add:adigittree:custgrpid="t100",digitstring="703484",callside="originating", setname="setone"
Step 2 To verify the command was executed successfully, enter the command:mml> numan-rtrv
Step 3 Repeat steps 1 and 2 for each entry you add to the A-digit tree.
Enabling A-Number Normalization
Enabling A-number normalization results in the removal of leading zeros from National (0) or International (00) European prefixes. This feature adds the ability to remove the leading zero from a UK-specific International format CLI (and the corresponding NOA change to International). In addition, this functionality can now be applied to both trunk groups and signaling services.
To enable A-number normalization for the trunk group or signaling service associated with your dial plan, complete the following steps:
Step 1 Enter the following command on the active Cisco MGC at the MML prompt:mml> prov-add:property:name="comp_name",anumnormalise=1
•property—MML component type for trunk group or signaling service properties. Select one of the following:
–trnkgrpprop—MML component for trunk group properties.
–sigsrvprop—MML component for signaling service properties.
•comp_name—MML name for the trunk group or signaling service on which you want to enable A-number normalization.
For example, to enable A-number normalization on a signaling service called va-5300-a, enter the following MML command:mml> prov-add:sigsvcprop:name="va-5300-a:,anumnormalise=1
Step 2 To verify the command was executed successfully, enter the command:mml> prov-rtrv
Step 3 Repeat steps 1 and 2 for each trunk group or signaling service on which you want to enable A-number normalization.
Dial Plan Examples
This section provides the following examples of dial plan provisioning for this feature. Additional examples of dial plan provisioning for the Cisco MGC software can be found in the Cisco Media Gateway Controller Software Release 9 Dial Plan Guide.numan-add:digmodstring:custgrpid="T002",name="restpfx",digstring="666"numan-add:resulttable:Custgrpid="T002",name="result5", resulttype="AMODDIG", dw1="1", dw2="0", dw3="restpfx",dw4="1",setname="setname1"numan-add:adigtree:custgrpid="T002",digitstring="612456",callside="originating" , setname="setname1"prov-add:trnkgrpprop:name="va-5300-a",anumnormalise=1
The following sections contain reference material related to this feature. Information is included on the following areas:
The Anumnormalise property was modified for this feature. This property is now a valid property in SS7-ITU and SS7-UK signaling services. For information on other properties for the Cisco MGC software, refer to the Cisco Media Gateway Controller Software Release 9 Provisioning Guide.
The parent objects for this property are found in Table 2.
Table 2 Software Property Related to this Feature
Property Name Parent Object AVM DPNSS EISUP IOCC ISDNPRI MGCP RLM SESSION SGCP SS7-ANSI SS7-China SS7-ITU SS7-Japan SS7-UK TALI-IOCC TCAPOverIP TrunkGroup VSI Anumnormalise X X X
The description for this property is in Table 3.
Note The property listed below is an existing property whose parent objects were modified for this feature. The definition has not changed.
Result analysis provides the capability to group actions into result sets that can be attached at different points of analysis. The main attachment points are: Pre-analysis, A-number analysis, B-number analysis, and Cause analysis.
The following result type definition is modified for this feature. For information on other result type definitions for the Cisco MGC software, refer to the Cisco Media Gateway Controller Software Release 9 Dial Plan Guide.
Table 4 shows the result type modified for this feature.
The AMODDIG result type is used to modification the digits of the A-number. It is returned from pre-analysis, A-number analysis, and B-number analysis. The datawords are used to control the digit modification process as follows:
•Application point (Dataword 1)—The point in the A-number where the digit modification begins. The valid values are:
–1—The start of the number.
–2 to 97—A point within the number.
–98—The end of the number
•Number of digits to remove (Dataword 2)—The number of digits to be removed from the A-number, starting at the application point.
•Modification name (Dataword 3)—A string of digits to be entered into the A-number, starting at the application point. The value can be 0 (default) or any integer string.
•Conditional indication (Dataword 4)—Indicates that the A-number is to be modified when certain conditions are met. The valid values are:
–1—Presentation restriction dependent.
Note The Conditional indication is added in Release 9.5(2), Patch 23. Previously, dataword 4 had no associated function.
Note When the conditional indication (dataword 4) is set to 1, you cannot provision a number of digits to remove (dataword 2) within that same command instance.
In an unconditional modification example, if the application point = 1, the number of digits to remove = 5, the modification name = 1321, and the conditional indication = 0, the modification begins at the start of the digit string, removes 5 digits, and replaces them with the digit string 1321. This yields a A-number as follows:
•A-number received before analysis = 01444 567891
•A-number post analysis = 1321 567891
In a conditional modification example, if the application point = 98, the number of digits to remove = 4, the modification name =1321, and the conditional indication = 1, the modification begins at the end of the digit string, removes 4 digits, and replaces them with the digit string 1321, if the presentation restriction is met. If the presentation restriction is met, this yields a A-number as follows:
•A-number received before analysis = 12345567891
•A-number post analysis =12345561321
If the presentation restriction is not met, the A-number is not modified.
Depending on the analysis area that invokes it, the AMODDIG result type has different functionality. The following are examples of this different functionality.
•In Pre-Analysis there are currently four serial stages that can produce the AMODDIG result type. In Pre-analysis, the results are cumulative. For example, if the CPC stage generates an AMODDIG result type, then the A-number is modified according to the result and this modified number then is the new A-number passed as input to the next Pre-analysis stage (TMR analysis). If the TMR analysis provokes another AMODDIG result type, then it further modifies the number and so on. Even though multiple modifications like this would seem excessive and unnecessary, the capability exists to ensure the required flexibility is provided.
•In Number analysis (A-number or B-number), functionality is different. Here digit analysis is applied (digit by digit) and it is possible to have the AMODDIG result type at multiple points if required. However, it is only the last modification result type that is applied.
If multiple A-number modification results are collected throughout analysis, each data set effectively over-writes and replaces the former one. This means that the last collected A-number modification result is the one that is applied. This is the case regardless of which phase of analysis the results occur (for example, in pre-analysis and B-number analysis) or within one phase of digit tree analysis (for example, in A-number or B-number analysis).
For example, if the received A-number is 1234 and at "1" an AMODDIG result type is received making the A-number 441234, the digit string is modified and analysis continues according to the digit analysis configuration. If another AMODDIG result type is received at 1234, making the A-number 551234, the earlier AMODDIG result type ("1") is discarded and the A-number now sent forward is 551234.
Conditional A-Number Modification Result Limitation
In a Conditional A-number Modification result, the privacy status of the CLI is assessed to determine whether to apply a modification string to the CLI. This prefix is applied to the CLI once all other number prefixing and normalization (that is, country code addition) is complete. To achieve this, the modifying digits are captured during analysis and stored for later application post-analysis and post-country code preparation of the number.
Digit removal is not allowed as part of Conditional A-number modification to prevent the possible stripping off of country codes and CLI corruption. Therefore, when the Conditional A-number modification result is enabled through the value specified in dataword 4, only the use of data words 1, 3 and 4 is permitted, omitting the digits-to-remove specified in dataword 2.
Combinations of Conditional and Unconditional A-Modification Results
You can have both Conditional and Unconditional A-number modification results as a combination in analysis, with some limitations. You can combine Conditional and Unconditional A-number modification results by provisioning each in a different phase of analysis, but you cannot have both in one phase of analysis. The rules are as follows:
•In Pre-analysis there are currently 5 stages which all have access to the same pool of result types. You can provision an Unconditional A-number modification result in one of these stages and it becomes input to the subsequent stages where you could have a Conditional A-number modification result. You cannot have both in one result set in a single pre-analysis stage as only the last result retrieved applies.
•In A-number analysis you can only have a single Unconditional or Conditional A-number modification result, even when the results occur at different points in the digit tree and hence in different result-sets. You cannot have a combination of both either in a single result-set or in different result-sets. In this case only the last result retrieved applies.
•In B-number analysis you can only have a single Unconditional or Conditional A-number modification result, even when the results occur at different points in the digit tree and hence in different result-sets. You cannot have a combination of both either in a single result-set or in different result-sets. In this case only the last result retrieved applies.
•You can have a Conditional A-number modification result in Pre-analysis and then later an Unconditional A-number modification result in A-number analysis (or vice-versa).
•You can have a Conditional A-number modification result in Pre-analysis and then later an Unconditional A-number modification result in B-number analysis (or vice-versa).
•You can have a Conditional A-number modification result in A-number analysis and then later an Unconditional A-number modification result in B-number analysis (or vice-versa).
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Table 5 contains definitions of acronyms and technical terms used in this feature module.