[Asterisk-Users] Interconnecting two lans using Asterisk over a PSTN

[Jean-Michel Hiver]

>If one have an Internet/SDL access is it possible to have a dual access, in
>such if one network fails, I can switch automatically to another?
>Here below the network architecture I imagine.
>
>(IP LAN1)-ASTERISK-(Digium FXO card)<-->(PSTN)<-->(Digium FXO
>Card)-ASTERISK-(IP LAN 2)
>  
>
I don't understand what you mean when you say "if one network fails, I 
can switch automatically to another".

- If you have to separate IP networks which are separately connected to 
the internet, and you want them to behave as if it was ONE lan, you can 
use something like OpenVPN or PopTop to securely bridge the two networks 
as if it was one big LAN.

- If you want to, you can set up each of your asterisk box to go though 
the other asterisk box in the event where the PSTN network of one of the 
offices is bust. This would require the IP connection to stay up though, 
which is unlikely if you have DSL (where as a rule of thumb, when your 
PSTN is bust your DSL is too)

Cheers,
Jean-Michel.

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