Session Management in VoiceXML/PHP

I'm trying to figure out how session management will work in the final application. Setting up x amount of phone numbers with the provider is _not_ an intelligent solution to this problem. Essentially, I need to route callers so that their input can write to different database tables in turn pulled in by the Web Get Data building block in VIRTOOLS. Having an exclusive feed into
VIRTOOLS gives better interactivity so that the particle systems are autonomous for movement and camera transition. In an ideal world, the number of users could scale up, but there is probably no time for this feature, so I'll set this value at 15 or something.

Here are the remaining technical steps I have till May:

-Find a way to have a unique voice session on one phone number
-Design a new voice interface (the existing hard-coded one was met with disapproval - it basically consists of users saying their names)
-Create new database tables
-Create new web feeds into VIRTOOLS