I am agree that asterisk 1.4.* will support to a lower configuration but the problem I am facing that the Zaptel card. The card that I have is TDM 400P, but I found tin the site that the minimum need is TDM800P for analog telephony.
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Anycomment is encouragable.
Will it work if I choose zaptel 1.2.* along with Asterisk 1.4 for GUI based application., I think my issue with card will solve but whether it will compatible with asterisk 1.4 or not, That I am not sure.