I am looking in to getting a 6509 with supervisor 2 module. I noticed that there was a fxs card avaiable and started to wonder if you had to use the unified software on a pc or if it would be possible to have the fxs card have a astrisk or other non cisco pbx handle the call processing. I have an astrisk server handling all the digital voip traffic and was going to get a pci card to handle the few analog lines i need to incorporate eventually. I would much prefer to be able to stick the analog card in the switch and leave the pbx vm free to switch hosts as needed for fallover and such.
I have been reading through the cisco site and get conflicting answers including that it does and does not support being used on ios. Having some one who has dealt with these before would be of great assistance.