During a power failure situation, analog pstn lines that connect directly to
the analog phones will most likely still be able to make and receive calls.
However, for the Asterisk implementation, unless you have a huge ups, you
will not be able to make and receive any call during power failure, since
there will be no power to the Asterisk server. And since all the incoming
lines, be it analog lines or T1/E1 are connected to the Asterisk, these
lines wont be able to function at all.
<snip>
There's been quite a bit of discussion on this list about failover scenarios and how to go about handling them; check the list archives for the discussions.
You can also look in the Wiki for some examples:
http://www.voip-info.org/wiki-Asterisk+failover http://www.voip-info.org/tiki-index.php?page=Failover%20switches http://www.voip-info.org/tiki-index.php?page=Asterisk%20High%20Availability%20Solutions
If you're talking about a simple installation with a couple of lines you could use the DPDT Relay solution, look it up in the list archives. For larger installations with mission-critical stuff then you'd want to use failover switches.
The Wiki has good resources, look it up there.
Flynn
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