[asterisk-users] question about CDR command

[unplug]

I want to set some custom data in the field of userfield in table CDR
as following.
exten => s,19,Set(CDR(userfield)=1234)
exten => s,20,Dial(SIP/1234)

However, the userfield doesn't get update after making the call.
After that, I relocate the command as following.

exten => s,19,Dial(SIP/1234)
exten => s,20,Set(CDR(userfield)=1234)

The userfield doens't get update at all.  I don't know why the field
can't update after issuing the command.  Anyone can help?