Dial option d

I am trying to use the option ‘d’ for Dial, but it doesn’t seem to work for me. Below is what I have in my extensions.conf:

exten => 201,1,Dial(SIP/201,20,d)
exten => 1,1,VoiceMail,u201

When I dial 201 from another phone, the phone rings, but it does nothing when I press ‘1’ while the phone is ringing. I turned on debugging but nothing happened when I press ‘1’. I am using asterisk on CentOS 4.5. Has anyone used this option? I also tried the example for RetryDial (voip-info.org/wiki/index.php … +RetryDial), didn’t work for me either. This option looks deceptively simple, am I missing something?

I also tried the H option, that didn't work either.
  • Wei

It does work in 1.2.28, I wonder in which version it starts working