[asterisk-users] Dial C option

[Master Abi]

Hello

I would like to NOT record a CDR for internal calls, but the C option 
(suppose to work like NoCDR() ) is just not working for me. My dial line is

exten => _70XX,1,Dial(SIP/${EXTEN}|20|Ctr)

Could someone give me a short example of using NoCDR correctly.

Thanks

Master