[Asterisk-Users] Distinctive Ring and zapata.conf

[Robert La Ferla]

Thanks.  Can anyone explain what the three values for the ring pattern 
signify?   I assume it's a ring cadence pattern (in ms) but shouldn't it 
be 4 values (ring on, ring off, ring on, ring off)  So is Asterisk 
ignoring the last "ring off"?  And does Asterisk have some tolerance 
value for the ring timing?  ie.  323 ms +/- 10ms or is it exact?

e.g.
dring1=323,0,0

Ring Patterns (Non-Asterisk)
http://resource.intel.com/telecom/support/tnotes/gentnote/dl_soft/tn235.htm