[Asterisk-Users] Is this connection scheme possible?

[Antonio Diego Almod�var Cebri�n]

I need to substitute a standard PBX. There are 70 intern analog phone lines, I mean, 70 analog extensions. Is this configuration possible?
Is there a cheaper solution?

                                         Asterisk
                              ________box______
________   PRI        |                            |
| TELCO |==========O||||O|||||O|||||O|||||||<= TE405P
|_______|                 |_____||__ ||___||__ |
                                         ||    ||     ||=(T1 crossover=>(T1 ChannelBank)
                                         ||    ||         
                                         ||    ||===T1 crossover =>( T1 Channel Bank)
                                         ||
                                         ||=== T1 crossover =>( T1 Channel Bank)
I need help please.

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