we are looking at creating a backup solution using a dialup configuration.
We have a 2851 RTR at our central location and 1841's at the 4 remote ends.
I'm pretty sure we can use the AUX port on the 1841 to connect to the external modem.
On the central office side, we want to have one box that the four sites call into. the 2851 has 3 big slots that unused but I don't know if the 2851 is able to do that or if we'll need a new box.