Whether it's a complementing IVR service flow to your BSS like ""top-up"" or ""balance check"" or a VAS on it's own like a Ring Back Tone Service.  CALLUP IVR is the main building block for such services.
CALLUP's IVR network and media component supports a wide array of connection types: PRI trunks, Call Control (SS7 ISUP and SIP), Voice Media (TDM and RTP)

CALLUP IVR application component has a wide range of supported commands, for example:

• Answer a call
• Play of a voice prompt
• Record voice
• Get DTMF input Call an external web service / module 
• Make a call
• Create a conference call
• Disconnect a call