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USSi Solution

2G and 3G are sunsetting, but USSD doesn't have to. Procescom's USSi gateway carries USSD over the IMS layer per 3GPP TS 24.390 — your subscribers keep dialing *100#, your back-end keeps speaking MAP or REST, and the access technology underneath becomes invisible.

USSi Solution illustration
Standards3GPP TS 24.390 (USSi)3GPP TS 24.501 (5G NAS)3GPP TS 29.518 (Namf_Communication)SIP / MAP / REST
USSD over IMS, transparently

USSD over IMS, transparently

SIP INVITE with vnd.3gpp.ussd+xml per TS 24.390. The USSi gateway terminates SIP and translates to MAP or HTTP/REST. No subscriber change, no app rewrite.

5G-ready USSF on the SBA

5G-ready USSF on the SBA

USSD over NAS to the AMF (TS 24.501); AMF talks to USSF via Namf_Communication (TS 29.518). USSF exposes JSON/REST so modern apps skip the SS7 detour.

Frees signalling and radio capacity

Frees signalling and radio capacity

Retires the 2G/3G CS fallback path. Existing USSD applications run unchanged on a 4G/5G-only network. Smaller STP footprint, fewer FS.11 surprises.