1. Do the above mentioned Routers series of 1841,2821 and 3825.Supports
along with voice ?.
2. If so then which type , whether FXO or FXS or both?
3. If they do support voice and in FXO mode then up to how many lines ?
4. Is Exchange necessary in case of a FXO?
In case the above mentioned Routers do not support FXO, FXS then kindly
suggest the router series that support the FXO and FXS .If it doesnt support why it wont support (reason)