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[coDID]
exten => s,1,Answer

The above answers the line immediately but the telco needs a wink 
first. So, I removed this line altogether. The wink then worked as 
expected but when the telco dialed one of our DID numbers, asterisk 
replied that it was not a valid number and the message "Unknown 
extension 's' " was on my console so I guess I need the s extension.

Does someone have an example of DID trunk configuration to share?

Don Pobanz