To communicate with the SS7 protocols in a network, you need to set up the SS7 signaling gateway client (SGC).

Integration with the Rhino VoLTE TAS and IN interfaces requires an SCCP address assigned to it.

Setting up the SS7 SGC

The SS7 SGC in the Rhino VoLTE TAS provides support for communicating with the SS7 protocols in a network. The configuration for it is located in the sgc-config.yaml file.

If the SGC is being reconfigured after its initial configuration has been applied, you need to follow the steps in Reconfiguring the SGC before applying the new configuration.

M3UA interface configuration

The SGC uses the M3UA (MTP Level 3 User Adaptation Layer) interface for handling networking between the Rhino VoLTE TAS and the network’s SS7 signaling.

General configuration

This configuration determines what the SGC’s attributes are for SS7 signaling. This will be what systems outside of the Rhino VoLTE TAS require to direct SS7 signaling towards the SGC.

What you need

The following must be defined in the configuration:

  • ❏ The local-port M3UA endpoint used for SS7 signaling.

  • ❏ The sccp-variant used by the SGC. Either ITU or ANSI.

  • ❏ The Rhino VoLTE TAS’s local point-code.

The following may be defined in the configuration:

  • ❏ The value for the national indicator to use for SCMG (SCCP management) messages.

    • This would override the defaults of INTERNATIONAL for ITU-T SCCP, and NATIONAL for ANSI SCCP.

  • ❏ The value for the M3UA network-indicator field.

    • This would override the default of INTERNATIONAL

Example configuration

The example configuration given in the snippet below sets the SGC in the Rhino VoLTE TAS to:

  • Have the SGC’s local endpoint port at 2905

  • Use the ITU variant for SCCP addresses

  • Have a local point code of 5

  • The default national indicator for ITU-T SCCP messages is used — which is INTERNATIONAL

  • The default network-indicator field is used, which is INTERNATIONAL.

sgc-config.yaml
deployment-config:sgc:
  m3ua:
    local-port: 2905
    sccp-variant: ITU
    point-code: "5"
Note The supported format of the point code depends on the sccp-variant. Contact Metaswitch support for further details if you would like to use these other forms.
If sccp-variant is…​ format of point-code is…​ Example

ANSI

- separated triplets, network-cluster-member format

0-0-5

ITU

simple numeric, quoted

"5"

Remote peer configuration

For details on how to configure remote peers in the Rhino VoLTE TAS, see SGC M3UA remote peer addresses.

Global title translation configuration

For details on how to configure global title translation in the Rhino VoLTE TAS, see SGC M3UA global title translation.

SGC properties

The Rhino VoLTE TAS supports further configuration of the SGC via the sgc-properties field. This field offers additional configuration of the SGC beyond the given declarative configuration.

For further configuration of the SGC, contact Metaswitch support for more details.

sgc-config.yaml
deployment-config:sgc:
  sgc-properties:

Hazelcast

The Rhino VoLTE TAS supports using Hazelcast for communication in the cluster of subsystems in the SS7 SGC stack. The declarative configuration in the hazelcast section allows for:

  • the number of backup instances in the cluster to be defined.

Warning Unless specified by Metaswitch support, the backup-count must be left unspecified. If incorrectly set, the cluster can experience data loss. The Rhino VoLTE TAS’s VMs will default to a valid and working backup-count.

  • an optional password for the Hazelcast subsystem.

Note The password will be automatically encrypted using the secrets-private-key configured in the site definition file (SDF).
sgc-config.yaml
deployment-config:sgc:
  hazelcast:
    backup-count:
    password:

For further configuration of using Hazelcast in the SGC, contact Metaswitch support for more details.

sgcenv

The declarative configuration supports configuring the port for which the internal sgc CLI in the SMO nodes is binded to. This is set in the jmx-port field.

sgc-config.yaml
deployment-config:sgc:
  sgcenv:
    jmx-port: 55555

What you need

  • ❏ An SS7 point code for the site.

  • ❏ A unique SCCP address to be the originating address for IN signalling for the Rhino VoLTE TAS.

Setting up for IN interfaces

The configuration for the IN signaling to the Rhino VoLTE TAS is in the sentinel-volte-gsm-config.yaml or sentinel-volte-cdma-config.yaml file.

In the service-centralisation section, configure the inbound-ss7-address value. The example configuration given here indicates input for what is needed for integrating the Rhino VoLTE TAS with the SS7 network.

sentinel-volte-gsm-config.yaml or sentinel-volte-cdma-config.yaml
sentinel-volte:

    # Service Centralisation configuration.
    service-centralisation:

      # The SCCP address of the Sentinel VoLTE AS.
      inbound-ss7-address: type=C7,ri=gt,ssn=146,nature=INTERNATIONAL,numbering=ISDN,tt=0,digits=123456
Warning If the inbound-ss7-address contains a pc= parameter, that parameter’s value must be the same as the point-code value in sgc-config.yaml. See General configuration.

The SS7 point code needs to be used consistently in other places.

  • In sentinel-volte-gsm-config.yaml or sentinel-volte-cdma-config.yaml file, if the inbound-ss7-address value contains a pc= parameter, that parameter’s value must be the same as the point-code value in sgc-config.yaml.

  • In sentinel-ipsmgw-config.yaml file, if the originating-address value contains a pc= parameter, that parameter’s value must be the same as the point-code value in sgc-config.yaml. For more details, see step 3 of IP-SM-GW Initial configuration.

Note Do not quote the point code in SCCP addresses, e.g. use pc=5, not pc="5". Quoting is only required when the point code is a standalone field value in a YAML configuration file.

There are also requirements for assigning SSNs correctly. Contact Metaswitch support for details.

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Rhino VoLTE TAS Version 4.1