SCCP:GTT Association Configuration

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The TB640_MSG_ID_SS7_SCCP_OP_GTT_ASSO_ALLOC (request/response) message is used to configure associations for Global Title Translation of the SCCP layer. An association specifies the translation procedure to be used for a particular type of global title. The user configures an association for each global title type in SCCP.

The following enumeration lists the different configuration parameters and their description:

  • The Network identifier parameter specifies the ID of the network
  • The Protocol variant parameter specifies the SCCP protocol variant. Allowable values: see Table 73 - SCCP protocol variant 08D0C9EA79F9BA .



  • The Global title format parameter specifies the SCCP GT format. Allowable values are:
Connection mode Description
Normal MTP2 layer is used in conjunction with an above MTP3 layer
HSL MTP2 layer high speed link is used in conjunction with an above MTP3 layer

Table SEQ Table \* ARABIC 83 - SCCP GT format type

Global Title Format Type

Description

TB640_SS7_SCCP_GT_FORMAT_TYPE_NOT_USED

Indicates that no global title is used.

TB640_SS7_SCCP_GT_FORMAT_TYPE_0

Indicates that no global title is used.

TB640_SS7_SCCP_GT_FORMAT_TYPE_1

Global title format 1.

TB640_SS7_SCCP_GT_FORMAT_TYPE_2

Global title format 2.

TB640_SS7_SCCP_GT_FORMAT_TYPE_3

Global title format 3.

TB640_SS7_SCCP_GT_FORMAT_TYPE_4

Global title format 4.



  • The Number of actions parameter specifies the number of actions configured for this association. Allowable values: 0 - 7.
  • The Array of actions parameter contains the actions for this association. Allowable values: see Actions structure definition below.



Contents

Action-specific configuration parameters

  • The action type parameter (ActionType) specifies the type of action for this association. Allowable values:
Connection mode Description
Normal MTP2 layer is used in conjunction with an above MTP3 layer
HSL MTP2 layer high speed link is used in conjunction with an above MTP3 layer

Table SEQ Table \* ARABIC 84 - SCCP GT action type

SSN value to identify SCCP user

Description

TB640_SS7_SCCP_ACTION_TYPE_FIX

Use a fixed range of digits to perform GTT. For example, use first 3 digits.

TB640_SS7_SCCP_ACTION_TYPE_VARIABLE_ASCENDING

Use variable number of digits GTT in ascending order. For example, use digits 4 to 6 in a variable fashion to perform GTT. In this case, variable means match the fourth digit, and if no match, then match the fourth and fifth digits, and so on.

TB640_SS7_SCCP_ACTION_TYPE_VARIABLE_DESCENDING

Use variable number of digits GTT in descending order. For example, use digits 4 to 6 in a variable fashion to perform GTT. In this case, variable means match the sixth digit, and if no match, then match the fifth and sixth digits, and so on.

TB640_SS7_SCCP_ACTION_TYPE_GT_TO_PC

Use digits in incoming GT as the point code for routing purposes. This type of GTT is used in ISNI.

TB640_SS7_SCCP_ACTION_TYPE_CONST

Always translate the incoming GT to a fixed address.


Insert PC Insert DPC before incoming GTAI and change TT, ES and NAI, leaving GTAI unchanged. This action is for modifying calling party address at an international Gateway, when message is entering international network, originating form a national network and having calling address in national specific format with Generic Numbering Plan. DPC inserted is the point code of the international Gateway, having capability to translate back the international address format to national specific address in response message. The DPC inserted, need not be the self point code of the international Gateway modifying the calling party address.

Strip PC If first six digits are self point code in international format, strip off first six digits from the GTAI. Then do the translation and replace TT, ES, and NAI. Examine the DPC of the translated address, if it is self, do translation of the resulting address again else message will be forwarded to DPC for further translation without changing GTAI of the called address.



  • The Start digit parameter specifies the starting digit of the range for this action


Note: Used only with action of type:

  • Fix
  • Variable ascending
  • Variable descending



  • The End digit parameter specifies the ending digit of the range for this action


Note: Used only with action of type:

  • Fix
  • Variable ascending
  • Variable descending



GT Format 1-specific parameters

  • The Odd even parameter specifies the odd or even indicator. Used to encode the odd or even indicator bit in the address parameter of an SCCP message. Allowable values are:
Connection mode Description
Normal MTP2 layer is used in conjunction with an above MTP3 layer
HSL MTP2 layer high speed link is used in conjunction with an above MTP3 layer

Table SEQ Table \* ARABIC 85 - SCCP GT odd/even type

GT Odd/Even Type

Description

TB640_SS7_SCCP_GT_ODD_EVEN_TYPE_NOT_USED

Not used.

TB640_SS7_SCCP_GT_ODD_EVEN_TYPE_ODD

Odd number of address signals.

TB640_SS7_SCCP_GT_ODD_EVEN_TYPE_EVEN

Even number of address signals.



  • The Nature of address parameter specifies the nature of address indicator. Used to encode the 7-bit nature of address indicator in the address parameter of an SCCP message. Allowable values are:


Connection mode Description
Normal MTP2 layer is used in conjunction with an above MTP3 layer
HSL MTP2 layer high speed link is used in conjunction with an above MTP3 layer

Table SEQ Table \* ARABIC 86 - SCCP GT nature of address indicator

GT Nature of Address Indicator

Description

TB640_SS7_SCCP_GT_NATURE_OF_ADDR_IND_NOT_USED

Not used.

TB640_SS7_SCCP_GT_NATURE_OF_ADDR_IND_SUBSCRIBER

Subscriber number.

TB640_SS7_SCCP_GT_NATURE_OF_ADDR_IND_NATIONAL

National significant number.

TB640_SS7_SCCP_GT_NATURE_OF_ADDR_IND_INTERNATIONAL

International number.




GT Format 2-specific parameters

  • The Use type value parameter specifies whether or not to use the translation type value. Note that the translation type value is required for GTT address map configuration and also to send data using GT but it is optional for GTT association configuration. When setting the use translation type value parameter to 'False' then type value is ignored (don’t care) for GTT association operation.
  • The Type value parameter specifies the translation type value. Used to encode the 8-bit translation type field in the address parameter of an SCCP message. Allowable values: 0 to 255.



GT Format 3-specific parameters

  • The Use type value parameter; see GT Format 2 explanation
  • The Type value parameter; see GT Format 2 explanation



  • The Numbering plan parameter specifies the numbering plan. Used to encode the numbering plan nibble in the address parameter of an SCCP message. Allowable values:


Connection mode Description
Normal MTP2 layer is used in conjunction with an above MTP3 layer
HSL MTP2 layer high speed link is used in conjunction with an above MTP3 layer

Table SEQ Table \* ARABIC 87 - SCCP GT numbering plan type

GT Numbering Plan Type

Description

TB640_SS7_SCCP_GT_NUMB_PLAN_TYPE_NOT_USED

Not used.

TB640_SS7_SCCP_GT_NUMB_PLAN_TYPE_UNKNOWN

Unknown.

TB640_SS7_SCCP_GT_NUMB_PLAN_TYPE_ISDN

ISDN/telephony numbering plan.

TB640_SS7_SCCP_GT_NUMB_PLAN_TYPE_TELEPHONY

Telephony numbering plan.

(Not valid in ITU96, ANSI96 and TELCORDIA)

TB640_SS7_SCCP_GT_NUMB_PLAN_TYPE_GENERIC

Generic numbering plan.

(For ITU96 only)

TB640_SS7_SCCP_GT_NUMB_PLAN_TYPE_DATA

Data numbering plan.

TB640_SS7_SCCP_GT_NUMB_PLAN_TYPE_TELEX

Telex numbering plan.

TB640_SS7_SCCP_GT_NUMB_PLAN_TYPE_MARITIME_MOBILE

Maritime Mobile numbering plan.

TB640_SS7_SCCP_GT_NUMB_PLAN_TYPE_LAND_MOBILE

Land Mobile numbering plan.

TB640_SS7_SCCP_GT_NUMB_PLAN_TYPE_ISDN_MOBILE

ISDN Mobile numbering plan.

TB640_SS7_SCCP_GT_NUMB_PLAN_TYPE_PRIVATE

Private network or network specific numbering plan.

(For ITU96, ANSI96 and TELCORDIA)



  • The encoding scheme parameter (EncodingScheme) specifies the encoding scheme. Used to encode the encoding scheme nibble in the address parameter of an SCCP message (supports only BCD encoding scheme). Allowable values:


Connection mode Description
Normal MTP2 layer is used in conjunction with an above MTP3 layer
HSL MTP2 layer high speed link is used in conjunction with an above MTP3 layer

Table SEQ Table \* ARABIC 88 - SCCP GT encoding scheme type

GT Encoding Scheme Type

Description

TB640_SS7_SCCP_GT_ENCODING_TYPE_NOT_USED

Not used.

TB640_SS7_SCCP_GT_ENCODING_TYPE_UNKNOWN

Unknown.

TB640_SS7_SCCP_GT_ENCODING_TYPE_BCD_ODD

BCD Odd.

TB640_SS7_SCCP_GT_ENCODING_TYPE_BCD_EVEN

BCD Even.

TB640_SS7_SCCP_GT_ENCODING_TYPE_NATIONAL_ES

National specific ES.

(Allowed only in ITU96)



GT Format 4-specific parameters

  • The use type value parameter; see GT Format 2 explanation
  • The type value parameter; see GT Format 2 explanation
  • The numbering plan parameter; see GT Format 3 explanation
  • The encoding scheme parameter; see GT Format 3 explanation
  • The Nature of address parameter; see GT Format 1 explanation
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