[asterisk-users] pstn failback

[stan ford]

On fonalities web page, i see they offer pstn failback as a feature of their asterisk package. i've also heard before of failing back to a pri line if your t1 voip line fails. my question is. in order to have pstn or pri failback, dont you basically have to have all the equipment there on standby, a PRI line, TDM cards, PRI/T1 cards, a bunch of digital or analong phones. it just seems like a whole lot of hardware to be sitting there waiting for a disaster. unless im just not understanding pstn/pri failback. can someone shed some light?
   
  also, if you've got a dedicated full t1 line for voice, and have a low amount of users for that t1, is there really to worry about failing back to a pstn? seeing how reliable a t1 is. is anyone out here using full voip telelphony solution only?
   
  thanks.

 		
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