Voicemail via SIP Alias?

I’m trying to create a custom extension to allow me to forward a call straight to voicemail using a sip alias for the extension. This is what I’ve been trying:

exten => awenv,1,Voicemail(${CHANNEL(language)}@default|u)

Where “awenv” = the custom extension being used as a custom destination
Where ${CHANNEL(language)} returns a value of “awen” at this point in the call
Where “awen” is the valid sip alias for extension 7000

But that just returns:

– Executing [[email protected]:3] Goto(“Zap/1-1”, “default|awenv|1”) in new stack
– Goto (default,awenv,1)
– Executing [[email protected]:1] VoiceMail(“Zap/1-1”, “[email protected]|u”) in new stack
== Auto fallthrough, channel ‘Zap/1-1’ status is ‘UNKNOWN’
– Hungup ‘Zap/1-1’

Suggestions? Help?