Analogue Extensions and PSTN network

Hello everybody,

We are currently in the process of moving away from our NEC aspire system and currently we have an ESIU card to connect to our 16 analogue handsets and another card for PSTN access.

I was wondering if anybody would be able to provide us with any guides as to which cards we can acquire that can accomodate 16 telephone extensions and 4 PSTN lines.

If there is an easier option without cards, I would love to hear about it.



If you want to put a card into a machine, then the Digium TDM2400 with the appropriate mix of modules to get your 16 station ports and 4 trunk ports.

You could also use a 4 port FXO gateway such as the Grandstream GXW4104 to get the phone lines in, and then simple ATA units at each of the desks to plug in the phones. But if you’re going to do that, it would probably work out a little better to just toss the analogue phones and put in native SIP phones, since the cost difference between an ATA and an inexpensive SIP phone is not really that much and you get greater functionality out of the SIP phone.