[Serusers] Voicemail implementation

Hi, First of all thanks to SER developers for the great work. I'm new to SIP and SER, I been playing with it a week ago and I was able to setup a 0.8.11pre, and now I want to try the voicemail service. It seems that I need to run another SER instance for voicemail and redirect the requests to that instance. It is posible to process the voicemail request on the same instance I use to forward/register users ? Or I need a second SER running. In case of 2 SER servers, it is posible to run them in the same box using diferent ports and diferent databases ? What are the combinations ? TIA -- Juanjo sin .sig :(