Sentinel VoLTE uses the CGIN RA for all of its interactions with an HLR over the MAP protocol.

MAP usage

Within Sentinel VoLTE, the main users of MAP and the HLR are:

  • FetchMSRN features --- Used to retrieve a subscriber’s MSRN from the HLR via a Send Routing Info request.

  • SubscriberDataLookupFromHLR --- Used to retrieve supplementary service data used for applying MMTel services from the HLR via a Any Time Subscription Interrogation request.

Configuration

Configuration for HLR communication is done via the HLRConfigProfileTable. This profile has the following fields:

Parameter Value Description

HLRSccpAddress

String encoding an SCCP Address

SCCP Address of the HLR, used when establishing the MAP dialog. Treated as a template when UseMsisdnAsHlrAddress is true.

SentinelSCCPAddress

String encoding an SCCP Address

SCCP Address of Sentinel, used when establishing the MAP dialog.

SentinelSCCPMscEndpointAddress

String encoding an SCCP Address

SCCP Address of Sentinel when Sentinel is acting as an MSC, used when establishing the MAP dialog. Will default to the value of SentinelSccpAddress if unset. Typically used to set a different originating SSN when sending a SendRoutingInformation message to the HLR.

SentinelAddressString

String encoding an Address String

Address of Sentinel included in MAP requests.

HLRInvokeTimeout

Long representing milliseconds

The timeout for waiting the HLR response. Used in the TCAP layer for the invoke timeout.

CallReferenceNumberSystemConstant

int between 0 and 65535

A constant value used during the construction of the Call Reference Number

UseMsisdnAsHlrAddress

Boolean

Controls whether to address the outbound HLR leg using a GT address formed by adding the subscriber MSISDN digits to the HLRSccpAddress above

SCCP Address Format

The configuration profile includes two SCCP addresses encoded in strings. Broadly speaking SCCP addresses come in two forms:

  • Point-Code Subsystem Number (PC-SSN)

  • Global Title Number (GT)

The string encoded format for an SCCP address takes the form of a comma separated series of key/value pairs. The exact set of valid keys varies between the two forms of SCCP address, and are outlined below.

Shared Key/Value Pairs

These keys are required in all SCCP Addresses.

Key Description Valid Values

type

SCCP Address Type

A7, C7, CH7, or J7

ri

Routing Indicator

gt for Global Title addresses, pcssn or ssn for Point-Code addresses.

PC-SSN Specific Key/Value Pairs

These keys are required only in Point-Code Subsystem Number SCCP Addresses.

Key Description Valid Values

pc

Point Code

Multiple formats (see below)

ssn

Subsystem Number

a number in the range 0-255

Point Code Formats Point codes can take the form of:

  • A single decimal value in the range 0-16777215, which supports all addressing formats up to 24-bits long expressed as a single number.

  • A '/' separated triple:

    • If type=C7 has been specified, an x/y/z triple is taken to mean the 3/8/3 bit fields of the zone/area/signal point address format.

    • If type=A7 or type=CH7, an x/y/z triple is taken to mean the 8/8/8 bit fields of the member/cluster/network address format.

Examples of a valid Point-Code SCCP Address

  • type=c7,ri=pcssn,pc=4012,ssn=123

  • type=c7,ri=pcssn,pc=1/245/7,ssn=123

GT Specific Key/Value Pairs

These keys are used only in Global Title SCCP Addresses. Of these keys, it is only mandatory to include digits in the encoded string.

Key Description Valid Values

digits

Address digits

Any digits string

nature

Address nature

international is the only value currently supported

numbering

Address numbering plan

isdn is the only value currently supported

tt

Translation type

a number in the range 0-255

national

National Indicator

true or false

gti

Global Tile Indicator

This value is automatically determined any may be omitted.

Examples of a valid GT SCCP Address

  • type=C7,ri=gt,digits=34607012345,nature=international,national=true

  • type=C7,ri=gt,digits=654444444,nature=international,numbering=isdn,tt=0,national=true

Address String Format

The configuration profile also includes an Address String encoded into a string. The string format is very similar to the GT SCCP Address format, however there are fewer keys and the key names are slightly different for equivalent value types.

Address String Key/Value Pairs

Key Description Valid Values

address

Address digits

Any digits string

nature

Address nature

INTERNATIONAL is the only value currently supported

numbering

Address numbering plan

ISDN is the only value currently supported

Example of a valid Address String

  • address=653333333,nature=INTERNATIONAL,numberingPlan=ISDN

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Sentinel VoLTE Version 2.7.0