[Asterisk-Users] Vonage, PSTN, 911, and hardware question

[Rajeev Sharma]

OK, first of all, thanks for all the great help everybody. It's nice to see that * has such a nice 
community!

Anyway, that double-pole-double-throw relay looks like just the right thing. If I'm understanding 
right, the relay design that Henry Devito sent me is the exact same thing as the Viking PF-6A. So, 
has anyone had experience with these things? Are they easy to build? (This is a home project, so 
things don't have to be professional.) Any tips? Right now I'm thinking of trying to build something 
out of this $1.25 12VDC relay (I believe Henry said it had to be 12V):
http://www.allelectronics.com/cgi-bin/category.cgi?category=500&item=RLY-87&type=store

As for the second ATA out of the * box, I'm looking for something like a normal ATA (i.e. the Digium 
IAXy), right? Any better low-cost alternatives? (Yes, I know that Digium is an * sponsor, but this 
_is_ and open source project, so I would think we should be able to talk about Digium alternatives 
on this list. * may not have existed without Digium, but the true value in OSS is that it can be 
used with any hardware, once you know how to code.)

As for the FXOs, I'm going to have to think about it. Currently I'm seeing the hardware shaping up 
to be 2 FXOs, 1 FXS, 1 ATA, the double-pole-double-throw relay, and the ATA that Vonage will provide 
me. (I'm going to stick with Vonage for now, as they are known for good service and great features.)

Thanks again!

Shane Young wrote:
> Quoting Rajeev Sharma <rajeev at hoojamomma.com>:
> 
> *snip*
> 
>>2. Phone availibility during a power outage is a big concern. I'm planning on keeping my regular
>>
>>PSTN line around for emergencies and 911 dialing (so that 911 calls actually go to the 911
>>center, 
>>along with my address). Is there an easy way for all the phone jacks in my house to automatically
>>be 
>>switched to the PSTN line if my broadband goes out?
> 
> 
> Using a double-pole-double-throw releay will do the trick for a single phone/line.
> 
> Viking makes a power fail transfer device (commonly built-in to many PBX's).
> 
> http://www.vikingelectronics.com/products/telephonemanagement/pf-6a(dbb).html
> 
> The PF-6A power failure bypass system makes it possible to receive calls during phone system and 
> power outages. The PF-6A bypass unit connects 6 pre-assigned single line station phones directly to 
> user-assigned C.O. trunks. 
> 
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