Archive for February, 2012

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.


Recently I had a customer that wanted to setup SIP Trunks on their old phone system.
When I arrived onsite I realized that they were using an old T1 and not a PRI.

At first I tried configuring the settings in the GUI but that just created a mess in the config and didn’t work.

After some digging around I got it to work with the following settings:

interface t1 0/2
  tdm-group 1 timeslots 1-24
  no shutdown

voice trunk T02 type t1-rbs supervision wink role network
  description “PBX”
  connect t1 0/2 tdm-group 1
  resource-selection linear ascending
  did digits-transferred 4
  rtp delay-mode adaptive
  codec-group Generic

The remaining settings are the same as a standard PRI.