I'm just now learning about VoIP, and here's my setup. I currently have a 2621XM router with c2600-ipvoicek9-mz.124-25b.bin IOS on my router. I currently have 128MB of RAM and 32MB of Flash. I would like to run call manager express 4.0 on my router, but one of our Voice Engineers said I needed to basically max out my router of RAM and Flash. From what i've been researching the 2621xm can only handle 256 MAX of RAM and 48MB of flash. Well I also learned that my IOS does not support call manager 4.0 so I have to buy flash.
I'm working on my CCVP track now and I was thinking about doing a full-blown call manager, but the Sr. Voice guy was like i need to learn express unity and call manager, well the only problem is my router has only one slot for a VIC. I need a FXO and FXS VIC and a NM-V1 for those VIC's and I also need to get a AIM-UME which I can not afford to buy they are WAY to expensive. So what I thought about was running my Call Manager Express and doing a full blown unity with exchange. The only question is, would my router with the current specs support what I'm trying to do?