Differences between the first and second generation Adtran Total Access 900 Series Gateways

Posted: February 21, 2012 in Adtran, VoIP Gateway

There are many used 1st Gen Adtran Total Access 900 Series Gateways out there at much lower prices than the 2nd Gen.

I was curious if there are major differences between the two units.
After some research I found the following:

Feature 1st Gen 2nd Gen
3 Way Conferences via FXS users 0 3
Max TDM to IP Call 24 30
Max T.38 Sessions 1 4
Echo-tail Length 16 ms 64 ms
Supports MGCP No Yes
Flash Memory 32MB 64MB

Based upon Echo-tail length increased to 64ms and the increased number of T.38 faxes I stick to the the 2ng Gen Gateways.

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