[asterisk-users] subscriber absent

[Ethy H. Brito]

Hi all

WE have some users that turns off their phones when they are not at home.

We see the warning message:

	Unable to create channel of type 'SIP' (cause 20 - Subscriber absent)

just after the Dial() command and a 

	Everyone is busy/congested at this time

message.

Where is this "unable - cause 20" status available in the dialplan? 
Which variable holds this?

We'd like to play something to the caller in case the user is absent.

Cheers

Ethy