Greetings, all.
I have a business requirement for an IVR platform. We are considering using VoiP for the connectivity to/from the PSTN.
On the patform we plan to use Nuance voice recognition. We also need to terminate and initiate calls, play pre-recorded messages and record what happens.
I'd need to have marketing pilot working by end December, and production-quality platform during Febuary.
I've extensive experience of real-time Java programming, but SIP & RTP are new to me (I've read the RFCs).
One option is to use sip-communicator as a starting point for the code. I've read the archives, and can see that someone got Nuance working.
How much risk would I be taking by going this way? Advice / comments welcome, on or off list 
Chris Haynes