iax2 dialtone inband


i wanna set my Asterisk to send over iax2 the dialtones as inband, that means that in the indications.conf of Asterisk1 is set to “country=us” and in Asterisk2 is set to “country=at”. The two Asterisk are connected together over iax2.
So when a user from Asterisk2 calls 160 (160 is a phone on Asterisk1) he will hear the us Dialtone.
What flag i have to set in the iax.conf?
In the sip.conf of both Asterisk is set progressinband=yes