Hi Laurent -
Is it "technically" good to connect an E1 span to 2 cards at the same
time (with only one accepting the calls).
Since it is possible with BRI cards, i'm wondering if it could be done
with PRI.
Nope. You can use a device like the Redfone fonebridge to convert the
PRI to TDMoE. Possible Downside: I've read some reports that say the
TDMoE module in asterisk is not so stable.
I've heard of a device that acts as a failover for a PRI line so you
can plug a PRI into two different devices and have the PRI failover if
one device fails. Unfortunately nothing like this is commercially
available today.
Another option: You can get some backup analog PSTN lines (or an
additional PRI), and work with your Telco to do something like a
busy-redirect - if the PRI device ever fails, calls go to the PSTN
lines. Of course, you'd lose DID capability in this scenario, but at
least your calls would go through.
- Noah
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