[Serusers] Auto-Attendant, REFER & Sems

(Oringinaly sent to the Sems list, thought it was relevant here as well.) So, I'm trying to build an achitecture that acceps calls from a third-party SIP PSTN gateway and runs them through a SEMS auto-attendant, then out to either local users or back to the PSTN gateway. The gateway won't support a REFER. Also, if I issue a REFER back to the PSTN, my SER will now be out of the loop, accounting-wise, right? In addition, I've got some issues with getting ivr.redirect() to work at all. (Other thread.) So, what is the smart road ahead here? If I need a B2BUA, can anyone recommend a good solution? Thanks, A. -- Adam Sherman Technologist