[Asterisk-Users] DNIS and DID seeking confirmation

[John Millican]

Hello all,
After much googling I have come to the conclusion that in asterisk land 
DID(Direct Inward Dial) and DNIS(Dialed Number Identification Service) are 
used rather interchangeably. If this is an incorrect assumption Please 
correct me.  Based on this assumption if I have everthing set up to land in 
the [incoming] context and an 800# such as 1-800-123-4567 with 4 digit DNIS I 
can have an entry in my incoming context  exten => _4567, 1, do something  
this is where the call to my 800 number will land regardless of which trunk 
the call comes in on. Like wise if I have a DID number 456-7891 with an 
exten=> _7891,1,do something else  this will also work.  Is this correct or 
am I way off base?
Also what is Asterisk looking for as far as a delimiter or is that in a config 
file?  Something like Seize (Wink) DNIS (Wink) ANI (Wink) Answer  or Seize 
(*) DNIS (*) ANI (*) Answer

John M