Satish,
In Cisco we usually refer to this term as Mobile Voice Access, or MVA. In regular CUCM business edition it's supported by using a H323 Gateway and a VoiceXML Script hosted on the CUCM server.
Unfortunately I'm not aware if this feature has been implemented on BE 3000, since the PSTN connectivity and all routing is based on CUCM. We would need to look at the datasheet for the BE 3000 to see if it supports MVA.