MMTel supplementary services on the TAS
CDIV (TS 24.604), Hold, Barring, CLIP/CLIR, Call Waiting, and multi-party conferencing per TS 24.610–628. S-CSCF Initial Filter Criteria invoke the TAS over the ISC interface.
IN Gateway / Services
An Intelligent Network gateway built around an IMS Telephony Application Server, with the legacy CAMEL/SCP path bridged for as long as you need it. MMTel supplementary services per GSMA IR.92, prepaid charging on Diameter Ro, and USSi for the services your subscribers still dial daily.
StandardsGSMA IR.92 (MMTel)TS 24.604 / 24.611 / 24.628Diameter Ro (TS 32.299)TS 24.390 (USSi)
Prepaid charging on Diameter Ro
Real-time prepaid voice over Ro with CAMEL IEC/ECUR per TS 29.078. CCR/CCA in milliseconds, Final-Unit-Indication for clean session close. Legacy SCP/gsmSCF paths bridged.
USSi keeps *100# habits alive
USSD over IMS per TS 24.390: SIP INVITE with vnd.3gpp.ussd+xml, terminated and translated to MAP or HTTP/REST. Subscribers see no change; your app talks REST instead of SS7.