[Asterisk-Users] Answer Confirmation "c"

[Me]

On this page in the Wiki:
http://www.voip-info.org/wiki-Asterisk+ZAP+Channels
This text exist:
*****************
If the letter c follows, then "Answer Confirmation" is requested, in which 
the call is not considered answered until the called user presses #.
*****************

Question:
From what I understand you can only use the 'c' option on Zap channels. Is 
there something similar that would allow answer confirmation on NON Zap 
channels?

Thanks!
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