What it does

The Rhino VoLTE TAS acts as a gateway for USSI (Unstructured Supplementary Service Data over IM CN subsystem) messages. SIP messages containing USSD payloads are processed by the Rhino VoLTE TAS and forwarded to the HLR over the MAP protocol. Responses are then encoded back into SIP and sent to the invoking subscriber.

This feature is enabled alongside the IP-SM-GW, and will be present if that service is configured.

Aside from network integration, the only configuration possible for USSI is to reject all incoming traffic.

Note The USSI only supports MAP-based SS7 protocols. CDMA networks are not supported.

Configuration

The example for sentinel-ipsmgw-config.yaml shows example configuration relevant to USSI in the sentinel-ipsmgw/map-messaging and sentinel-ipsmgw/ussi sections.

What you need

  • ❏ The text of the USSI rejection message, if disabling the service.

Initial configuration

As the USSI service runs alongside the IP-SM-GW, the IP-SM-GW service must be configured following the instructions in Initial configuration.

Setting up USSI

I want to…​

Reject all USSI messages

Uncomment the entire ussi block.

Set the language and message as desired.

  ussi:
      reject-all-with-default-message:
          language: "en"
          message: "USSD messages are not supported - check your balance on example.com"
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Rhino VoLTE TAS Version 4.2