====== FXS Port ======

====== Configuration ======
  * Signal default is loop start
  * cptone - Call Progress tone
  * ring cadence pattern01 = US
<code>
voice-port 0/2/0
  signal ground-start
  cptone GB
  ring cadence pattern01
  no shut
</code>

====== Timer ======
  * Initial - time to provide dial-tone
  * hookflash 
    * Pressing flash button (essentially going on-hook and off-hook) to invoke a feature
    * Timer use to distinguish btw actually hanging up
<code>
voice-port 0/1/0
  timeouts initial <secs>
  timeouts interdigit <secs>
  timeouts ringing <secs>
  timing hookflash-in <ms>
</code>