I am looking into a solution for a company which needs a box which allows remote devices to dialin and gain network access as well as dial out to the same devices from within thier network.Based on my research the AS5XX series of access servers can do this but I also recongnised that the AN ISR router with an E1 interface and a digital modems may give the same functionality are there are benefits of one option over the other.
The AS5xxx is aimed to SPs or high density applications.
The ISR routers to enterprise customers rarely requiring more than few channels at time.
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