[Freeswitch-users] progressinband=yes in freeswitch?

Hello, we have some delays with media setup with Aastra SIP over DECT phones. Aastra recommends using "progressinband=yes" for Asterisk so that the media to the phone is already setup during ringing phase. Are there any parameter in Freeswitch to support that? If yes: As we have registered more than one phone (Aastra SIP/DECT + Snom) to one extension, do we expect any problems in that case when media is already setup to both phones during ringing time? Best regards Peter